Orange FM ROM v1.5 Changelog

- New: The Orange FM ROM is now open source! A lot of code cleanup was done, and the asset pipeline was improved.
- New: Added key repeat to palette editor for easier precise changes
- New: Added lock options "Theme BG" and "Black" (nice for OLED screens)
- Changed: Renamed lock option "Disp. Off" to "LCD Off", and made it work on SGB (will appear solid black)
- Changed: Renamed lock option "Disp. On" to "Normal"
- ... and other minor changes and optimizations :)