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

applications/services/desktop/desktop_i.h

@@ -2,6 +2,7 @@
 
 #include "desktop.h"
 #include "desktop_settings.h"
+#include "desktop_keybinds.h"
 
 #include "animations/animation_manager.h"
 #include "views/desktop_view_pin_timeout.h"