Change the the render() API!
THis introduces some regressions with the Effects3D app.
Major: change of API.
Split DFramebuffer into Framebuffer and Screen; introduce the 'DistortedInputSurface' and 'DistortedOutputSurface' interfaces.
Try using OpenGL ES 3.0 everywhere (but if device does not support it, try creating 2.0 context - this is important because of the emulator!)
Rename Grid to Mesh
New DistortedProgram class.
Beginnings of support for postprocessing Effects.
Minor
Mirror: replace the Head bitmap.
Slight improvement for the Mirror app.
Mirror app finished (well, we still need to get some better bitmap for the girl)
First attempt at the 'Mirror' app.