Distorted Android

Fixes for z-fighting.

A Lot of fixes for the issues uncovered by Olimpic.

Still at least 1 known issue: sometimes, when we re-add a Surface, some garbage pops up on the screen for a brief split second. Visible in Olimpic.

Beginnings of the 'Multiblur' app.

Improvements for the 'Cubes' and 'Effects3D' apps.

New 'Blur' App. Actual BLUR effect, of course, does not work.

FBO APP: add dynamic adding/removing the DEPTH attachment.

Correction for the 'Girl' app.

Improve the Sink app (funny?)

First attempt at the 'Mirror' app.

Fix a lot of Lint warnings in the apps.