Distorted Android

Change of API in anticipation for MeshCubes of any depth (currently only 0 and 1 work)

Fix creating FBOs with combined DEPTH/STENCIL.

This makes the Stencil app fully work, including rendering thru a FBO.

Progress with Stencil app. Rendering through an intermediate FBO still doesn't quite work.

Add possibility to create FBOs with combined DEPTH/STENCIL.

Simplify setting up DistortedScreen.

1. Correct some bugs in DistortedRenderState
2. Thus make the Stencil App work
3. New icon for it

Progress with Stencil App; should be working now AFAIK but doesn't.

Beginnings of Stencil App.

Some corrections so that most apps still work on the Android emulator (OpenGL ES 2.0-based)

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