Keyboard Support

[hnlkaitan]

Is your feature request related to a problem? Please describe. N/A

Describe the solution you'd like In the Settings page, an area where we can map keyboard inputs → DS inputs (D-pad, A/B/X/Y buttons, etc.)

Describe alternatives you've considered Defaulting to "standard" emulator mappings with profiles (ex. one profile used WASD for D-pad, another uses arrow keys).

Additional context As a Magic Keyboard for iPad user, being able to use the keyboard to play on the emulator would be a great addition, as right now I'd have to detach the iPad, and use the device bare to play a game. It'd be closer to playing on an emulator in a desktop setting, and as I find myself using my iPad more and more in place of a laptop, it'd make the experience better.