* [212x64] Main view toggle LS groups 1-32 and 33-64 with +/-/encoder. Closes#5476
* [212x64] Also allow encoder events in channels view for switching channels range (fix for X9E).
* Pad LS range numerals to 2 digits.
* [firmware][gui] Adjust custom failsafe (and some channel display) ranges for proper extended limits (fixes#4447). This also fixes some display issues in *x64 GUIs when adjusting failsafe settings and cleans up code in those functions.
* [firmware][gui] Fix 480x272 channel output progress bars to show full extended limits; Fix alignment issues on all 212x & 480x gui mixes screens with custom channel names; Streamline some channel outputs display code.
* Fix AVR build.