Desktop settings merge and refactor, keybinds improvements

- Keybinds in own code helper files
- Keybinds as flipper format, loaded only when ran, no limit on length
- Migrate from old keybinds
- Merge desktop settings refactors after LFS removal PR
- Statusbar clock setting in desktop settings like OFW
- Hand orient setting in system settings like OFW

lib/momentum/settings.h

@@ -71,7 +71,6 @@ typedef struct {
     bool lockscreen_prompt;
     bool lockscreen_transparent;
     BatteryIcon battery_icon;
-    bool statusbar_clock;
     bool status_icons;
     bool bar_borders;
     bool bar_background;