Add URL scheme support on iOS / iPadOS

[pacorob]

What should happen

Launch the app with an URL scheme so I could easily / quicker launch the game from a game controller launcher such as abxylute app or e.g. Launcher widget as now you have to either manually press 'open' on the iPhone screen to launch or in case of Launcher widget app they instead use Apple Shortcuts app (less ideal as it ads an additional step).

How to do this: Apple developer page instructions

Who would this benefit

Players that use game launchers such as the Abxylute S9 controller using the Abxylute game iOS app.

Platform (if relevant)

iOS

Games this would be useful in

any type of PPSSPP game to launch via a (game) launcher

Other emulators or software with a similar feature

It does already work for Delta emulator which uses delta:// as URL scheme and therefore you can open the emulator directly from e.g. Abxylute iOS app game launcher after allowing it for the first time with 'Open' and thereafter automatically press and launch via controller without touch on the screen.

Checklist

• Check the latest git build in case it's already implemented.
• Search for other requests of the same feature.