finally added a change log

(only has half a year of history though; needs older stuff added)

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+# ChangeLog
+
+Items should be sorted roughly in order of most to least important, with 
+model-specific changes at the bottom.  Most items should use one of these 
+formats:
+
+  - Breaking change:
+  - Added
+  - Fixed
+  - Removed
+  - Changed
+  - Documented
+  - @brand-model: Hardware-specific change (NNNN, NNNN, ...)
+
+# Next
+
+# 2023-10-31
+
+General:
+
+- Finally finished converting all lights to the multi-channel API.
+  (but a few are untested due to hardware being unavailable)
+- Enabled smooth steps on almost all supported lights, including old ones.
+  (in some cases, on old t85 lights, some other things may have been removed
+   to make room)
+- Made smooth steps work better, and fixed several bugs.
+- Added/fixed RGB aux voltage on dual-fuel AA/li-ion drivers.
+- Fixed delay timing on all supported MCUs, so 1 "second" is closer to an
+  actual second (like in beacon mode or biking mode).
+  (especially attiny1616, which was 17% too slow)
+- Raised default thermal limit to 50C on attiny1616-based lights, since
+  it doesn't need as big an error margin as older MCUs.
+- Fixed missing item in globals menu on some lights.
+- Misc internal improvements and per-light tweaks.
+- Added a ChangeLog.md, to periodically summarize changes in a format which is
+  more readable than the raw commit logs.
+
+New lights:
+
+- @thefreeman-boost21-6a: Added.  (1631)
+  (very nice HDR boost driver which fits into a FW3A)
+- @thefreeman-boost-fwaa: Added.  (1632)
+  (very nice AA/li-ion HDR boost driver which fits into a FWAA)
+
+Hardware-specific changes:
+
+- Upgraded several builds to use delta-sigma modulation (DSM), for
+  lower lows and smoother ramping with less flicker or ripple:
+  - @blf-lt1  (0621)
+  - @blf-lt1-t1616  (0622)
+  - @emisar-d4k-3ch  (0151)
+    (**dramatically** improves resolution and low modes on its 8-bit channel)
+  - @noctigon-dm11-boost  (0273)
+  - @noctigon-kr4-boost  (0216)
+  - @noctigon-k1-boost  (0253)
+  - @noctigon-m44  (0143)
+
+- Upgraded some builds to use dynamic PWM, for lower lows and smoother ramping:
+  - @blf-q8-t1616,  @sofirn-sp36-t1616  (0613, 0614)
+  - @gchart-fet1-t1616  (1618)
+  - @noctigon-k1-sbt90  (0252)
+
+- @wurkkos-ts10, @wurkkos-ts10-rgbaux: Fixed too-high default ceiling.  (0713, 0714)
+
+# 2023-10-01
+
+General:
+
+- Updated a bunch of lights to work with the new multi-channel API.
+- Added "smooth steps" a.k.a. "soft start", to make on/off and step changes
+  smooth.  (enabled by default, can be turned off in Ramp Extras menu)
+- User can save a different channel mode for each strobe-group mode.
+- Made strobes/blinkies more responsive in Tactical Mode.
+- Fixed bug: Tactical Mode clobbers strobe group memory.
+- Fixed some minor post-off voltage display bugs.
+- Made RGB button brightness update faster in blinky modes.
+- Fixed bug: Wrong channel after colored factory reset.
+- @attiny1616, @attiny1634: Partially fixed oscillating aux LED voltage 
+  colors while off.  Better than before, but can still happen in some cases.
+- @attiny1616: Fixed spurious voltage warnings in sleep mode.  (it could 
+  sometimes go from Lockout mode to Off mode by itself)
+- Lots of internal refactoring.
+
+New lights:
+
+- @emisar-2ch-fet: Added.  (0136)
+- @emisar-d4k-3ch: Added.  (0151)
+- @noctigon-m44: Added.  (0143)
+- @wurkkos-ts10-rgbaux: Added.  (0713)
+
+Hardware-specific changes:
+
+- @ff-e01, @ff-pl47, @ff-pl47g2: Enabled smooth steps instead of SOS mode.
+  (0421, 0422, 0423, 0441)
+- @emisar-2ch, @noctigon-m44: Added RGB aux channel modes.  (0135, 0143)
+- @emisar-2ch-fet, @noctigon-k9.3: New ramps with better-calibrated shape.
+  (0136, 0261)
+- @emisar-d4v2-nofet: New ramp table.  (0115)
+- @emisar-d4sv2-tintramp: Removed / renamed.  (0135, 0136)
+- @noctigon-k9.3: Fixed years-old mess.  Merged builds, converted to
+  multi-channel, removed old builds, generally got K9.3 working quite a bit
+  better.  (0261, 0262, 0263, 0265, 0266, 0267)
+- @noctigon-m44: Lower moon, and greatly reduced flicker.  (0143)
+- @sofirn-lt1s-pro: Allow configuring the blink channel.  (0623)
+- @wurkkos: Raised default temperature limit to 50 C.  (07xx)
+- @wurkkos-ts10: Better / smoother ramp.  (0713, 0714)
+
+# 2023-06-29
+
+- Fixed red aux blink on 1st frame of post-off voltage display
+- Removed Harry Potter references because its author (J.K. Rowling) spreads 
+  hate
+- @noctigon-kr4: Fixed thermal regulation (0211, 0212, 0213, 0214, 0215, 0216)
+
+# 2023-05-30
+
+- Breaking change: Changed version check from YYYYMMDDXXXX to XXXX.YYYY-MM-DD, 
+  where the punctuation makes a "buzz" instead of number blinks.
+- Fixed issue where some lights always thought they were overheating (when 
+  cold, or after a factory reset)
+- Fixed aux pre-flash
+- Fixed a rare corner case where gradual brightness adjustments stopped at 99% 
+  power instead of 100% power while going up from level 149/150 to 150/150 on 
+  some lights
+- Changed "0" digit readout to use the same timing as other short blinks, to 
+  help ensure it works on all lights.
+- Minor code changes with no runtime impact
+- Documented new version check format
+- @wurkkos: Added red+blue police strobe (0715, 0716, 0717)
+- @noctigon-kr4: Broke thermal regulation (oops) (0211, 0212, 0213, 0214, 
+  0215, 0216)
+- @noctigon-kr4: Use 7 aux channel modes instead of 3 (0211, 0212, 0213, 0214, 
+  0215, 0216)
+- @emisar-d4v2: Changed number blinks from aux to main LEDs by default (0113, 
+  0114, 0115, 0123)
+
+# 2023-05-17
+
+- @noctigon-dm11-12v: Renamed to noctigon-dm11-boost (0273)
+- @noctigon-dm11-boost: Now supported in multi-channel branch (0273)
+
+# 2023-05-02
+
+- Added ability to set channel mode for number readouts (batt check, temp 
+  check, version check). Press 3C in batt check mode to change the blink 
+  channel.
+- Changed post-off voltage display:
+  - Display for 4s by default, not 5s
+  - Made timing user-configurable in battcheck 7H menu item 2
+    (1 click per second the display should last)
+  - Use low brightness when torch was at moon level before
+  - Skip the voltage display after UI actions which didn't change the mode 
+    (like "Off -> 7C" to change aux LED settings)
+- Changed RGB button behavior: While torch is on, use low mode below a 
+  configured level for real-time voltage color display, instead of always 
+  using high mode
+- Fixed bug: Channel change could stick when activating a config menu from 
+  battcheck (the blink function changed the channel, then the config menu 
+  saved it, then the blink function restored it, then the config menu restored 
+  it to the value it saved, which was wrong)
+- Documented ramp 6C, ramp 4C, ramp 4H, lockout 3H, battcheck 3C, and post-off 
+  voltage display config
+- @emisar-d4v2: Added the rest of the aux RGB colors as channel modes, and set 
+  aux "white" as the mode it uses to blink out numbers (0113, 0114, 0115, 
+  0123)
+- @wurkkos-ts10: Converted to multi-channel, and gave it a new ramp with 
+  better low modes (0714)
+- @wurkkos-ts25: Converted to multi-channel, and gave it a smoother ramp 
+  (0715)
+- @wurkkos: Added Wurkkos FC13 and TS11 (0716, 0717)
+
+# 2023-04-29
+
+- Changed lockout mode:
+  - Fixed manual memory timer and tint
+  - Added 3H for next channel (to change channels without unlocking, was 
+    possible before but needed to be updated for the new channel system)
+  - Made 3H+ use mem level instead of lowest moon (this is needed for
+    making the channel discernible, and also helps make aux LED controls
+    stand out more)
+- @emisar, @noctigon: Added Extended Simple UI to Hank's config, so a few more 
+  features are allowed in simple mode
+- @emisar-d4v2, @noctigon-kr4: Slightly smaller ROM size
+- @emisar-d4sv2: Converted to multi-channel, and updated it to use dynamic PWM 
+  for a smoother ramp with lower lows (0133, 0134)
+- @noctigon-kr4: Converted to multi-channel (0211, 0212, 0213, 0214)
+- @noctigon-kr4: Don't blink at top of regulated power (0211, 0213, 0214)
+
+# 2023-04-28
+
+- Added voltage display (by color) on RGB aux LEDs after turning the main LEDs 
+  off
+- Changed RGB aux: Always preview in high mode while changing color or pattern
+- Changed default RGB aux color in lockout mode: Uses blinking voltage, 
+  instead of blinking disco (unless model-specific config defines a different 
+  default)
+- Changed tactical mode default config: only use 2-color strobe if it's on 
+  main LEDs, not aux LEDs
+- @emisar-d4v2: Smoother ramp (0113, 0114)
+- @emisar-d4v2: Added hidden channel modes for RGB aux LEDs (0113, 0114, 0115)
+
+# 2023-04-27
+
+- Changed channel mode menu to preview channels during configuration
+- Changed tactical mode default config: use 2-color police strobe if it 
+  exists, instead of single-color strobe
+- Fixed unnecessary flickering when changing channel modes from/to the same 
+  value
+- Fixed sleep voltage measurement on attiny1616
+- @noctigon-kr4-tintramp: Converted to multi-channel, renamed to 
+  noctigon-kr4-2ch (0215)
+
+# 2023-04-25
+
+- Fixed old old bug(s) with voltage measurement while asleep, while also 
+  adding other improvements:
+  - Fixed oscillating RGB aux colors while asleep in voltage mode, mostly.  
+    Some much smaller oscillations are still possible, but the primary issue 
+    has been fixed, I think.
+  - Fixed old old bug which could cause spurious low-voltage warnings while 
+    asleep (previously required a messy code workaround).
+  - Reduced avg standby power by ~15uA.
+  - Now measures voltage every 1s instead of 8s while asleep.
+  - Changed RGB aux behavior: Puts aux LEDs in high mode for 3 seconds after 
+    light goes to sleep (much easier to see the voltage this way)
+    (this change was obsoleted soon by a better post-off voltage display)
+  - Broke sleep voltage measurement on attiny1616 (oops)
+- Changed internal details for how gradual ramping works
+- @emisar-d4sv2-tintramp: Converted to multi-channel, renamed to emisar-2ch. 
+  (0135)
+- @sofirn-lt1s-pro: Updated to use today's new code internals (0623)
+
+# 2023-04-19
+
+- Added stepped tint ramping
+- Documented new channel modes system
+- @sofirn-lt1s-pro: Added white-only auto-tint mode (0623)
+
+# Older: TODO
+
+- Need to import old commit logs as changelog items
+
+
+<!-- vim: set textwidth=78 shiftwidth=2 -->
+