[Enhancement] Button mappings should not follow the physical layout of different consoles (at least not by default)

[broccoli-is-healthy]

It can get very confusing (especially for people new to emulation, or for people that never played these systems before) when in one game the A button is the A button and it's the B button in another one, etc.

I can think of few solutions:

• Provide 2 different mappings (one that follows the physical layout of the emulated console and other that follows FunKey's layout) that can be selected from the global menu
• Show a prompt when launching a game for the first time that shows that the buttons are mapped differently (this should be accessible from the menu too so that it can be viewed again)
• Provide a simple re-maper