[Fulfilled] Pause menu button for all platforms

[Talei]

Hello,
First of all great work on PPSSPP to all devs. Keep it up really good work.

Suggestion / request about additional on screen key / button with the same functionality as Escape.

I do own Yoga portable and when I do use it in tablet mode keyboard is not active and there is no way to go back to the menu. Especially in full screen mode.

It would be nice if new button with functionality "go to the menu" was added into app.

Best regards