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.
Again change of API. Now instead of the 'DistortedEffects.draw() and DistortedTree.draw()' we have 'DistortedFramebuffer.renderTo()'
Change of names.
Change in the API: we always have to create a DistortedFramebuffer to render to.
Fix 'Deform' and 'Projection's behaviour after onPause().
Hide the 'depth' of a DistortedTexture inside the library, so users do not get exposed to this weirdness.
Complete the split DistortedObject -> (DistortedTexture,DistortedEffectQueue)
Rename various classes; fix a bug in Around the World.
Major change in API: separate the GRID from DistortedObject; completely remove classes derived from DistortedObject.
Fix with Projection
Turn the former 'FOV' app into 'Projection' app that also checks the (x,y) the camera looks at.