Revert "Fix Android back button behavior"

This reverts commit 7f29724a8561dee3e10306d280e8eb8c6c668bcc.

Conflicts:
	MonoGame.Framework/Android/AndroidGameActivity.cs

Conflicts:
	MonoGame.Framework/Android/AndroidGameActivity.cs
Fix AndroidGamePlatform.Exit() behavior
SpriteBatch multipass rendering

Support for multipass effects in SpriteBatch
Fix for PSM

fixes PSM and applies the spritePass regardless of whether or not an
effect is used
Quick fix

Fixed pass order
Missed a PSM draw call

Missed a PSM draw call
MonoGame builds don't need this hack.
Merge branch 'develop' into build
Fix to remove the last message on the message pump (typically WM_QUIT).
The missing source effect files.
Moved XNA effects to its own folder.
Fixed FX files to compile under DirectX 11 for MonoGame.
MGCB build script for DirectX effects.
Oops... we don't use this one.
Fixed missing inputs required for DX11 effects.
We now pick the right effects depending on platform.
Fixed included effect assets in projects.
Prebuilt DX11 effects.
Fixed crash when calling Game.RunOneFrame().
Fixed DirectX effects to be level 9.1 compatible.