Distorted Android

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.

Minor

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.

Adjustments for the 'Flag' app.

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