Drop back down to GCC 4.6 for Android until the ARMv6 crash can be figured out.

See issue #4798 .
Add share button to credits screen on Android
Always show zip files as full lines, to emphasize that they are different than working games.
UI fixes (including zip button clickability)
Touch buttons: Center the triangle in the circle. See #4799 for explanation.
Add trivial "Show in Folder" functionality to game screen
Disable "hold" on zip buttons. Add subtle glow to indicate to keep holding game buttons.
DPad cosmetics: Move the arrows outwards a bit