Add a way to access the native menus in various emulators

[ridgekuhn]

Is your feature request related to a problem? Please describe.
The FunKeyOS menu is nice and it’s great to have a consistent experience throughout, but it would also be great to be able to access the native menus for the various emulators somehow. ie, For selecting game-specific BIOs in PCSX or PicoDrive, selecting palettes in GNUboy, accessing native savestate ops, re-mapping buttons, etc

Describe the solution you'd like
If possible, using Fn + Power as a shortcut would be intuitive since it’s already the menu button when not holding Fn.