Distorted Android

Fixes for the Rex Cube (mostly works now)

Bugfix: fix a long-standing bug where switching on normal vector drawing would interfere with transparency.

Bugfix: always normalize the normal vector after modifying it, otherwise the next effect might not work correctly (Distort!)

Bugfix: we initially need to set the maxTextureSize to MAX_INT, because otherwise early (i.e. before a call to onSurfaceCreated) calls to setTexture() will fail.

Put new things to the StackFrame.

Put new things to the StackFrame.

Minor.

Fix the fact that the static DistortedEffects.mAllQueues was global, shared between all Activities.
Completely replace this mechanism with a non-static list of links from a VertexEffect to all VertexEffectQueues this effect is a member of.

Fix the fact that we would keep adding new InternalBuffers to the 'Done' list - split 'invalidate()' and 'recreate()' to two separate actions!

Start creating the Tutorial Activity.