Distorted Android

Move all the knowledge about Vertex and Fragment effects to their respective classes.

Simplify Effect classes.

Change of API: move setting the EGL context back to the APP.

Change of API: move setting the EGL context back to the APP.

Beginnings of support for the unified Data data type.

Fixes for removing effects.

Small API simplification.

Remove old facility to correct Postprocessing buckets on new Postporcessing effects.

New facility will follow shortly....

Remove DistortedEffectsPostprocess and unify it with DistortedEffects.

Job not finished - doesn't compile now!

Fix the final 'Vertex & Fragment Effects' APP. All APPs work now!