Distorted Android

Beginnings of the GLOW unit test.

Progress with any depth MeshCubes.

Progress with any depth MeshCubes.

First try to convert the Stencil app to a dual (directly to Screen / through intermediate Framebuffer) mode.
Doesn't work yet ( API is inconvenient / plain wrong )

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

Beginnings of Stencil App.

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

Merge branch 'transform-feedback'

Use Transform Feedback to (optionally) display the Normal vectors.

Minor.