Distorted Android

Stencil App: Do not request any special EGL config; with DistortedScreen now buffered, we don't have to (and in fact this config doesn't exist on HTC Desire 12)

Try and avoid re-sorting the children by buckets (if we can!). This makes change in rendering order in the 'Transparency' app actually work.

In an attempt to contain the flashes on Mali GPU, re-structure the post-processing FBOs from 1 FBO with 2 color attachments + combined depth-stencil to 2 separate FBOs sharing a depth-stencil texture.

Result: this appears to make the flashes slightly worse.

Remove the Mali app (it was a silly mistake!)

Simplify Mali app.

Actually display the new Mali app.

New self-contained (i.e. not dependant on the library) App to check bugs on Mali GPU.

OIT: more fixes

OIT: fixes. Everything looks correct now except for the curious return of the 'dancing lower-left corner' small glitch in the 'Transparency' app.

Reengineer DistortedScreen