[Fulfilled] Pause menu button for all platforms

[TheDax]

For the Windows key remapping thing, no.

For the pause button visibility: https://github.com/hrydgard/ppsspp/pull/5568.

The pause button will be available for all platforms in the next build (check the buildbot if you want it now, or wait until the next major release).

Note: The exact option text in the screenshot might be a bit different when you see it, but basically, look for "Show pause menu button" under the touch control section. Currently you cannot move its position on-screen, either.