Distorted Android

Upgrade from GLSL 1.00 to GLSL 3.00 ES
Introduce separate BLUR1 and BLUR2 shaders, the second one marging (writing to gl_FragDepth still does not work)

Simplify BLUR shader.

New 'glClearColor' and 'glClearDepthf' APIs in OutputSurface. This fixes the 'transparency' regressions from last commit.

Progress with Multiblur.

This introduces some regressions with transparency (see: 'Different Bitmaps' and 'Around the world' )

Minor.

Bugfix: we need to have DepthMask and ColorMask both fully on when clearing the FBO in Nodes!

Important bugfix in Dynamic - sometimes it would never stop interpolating and never send a FINISHED message!

Advances in Multiblur - breaks BLUR for now.

Now there's a single place one can have a look at all the Meshes being rendered to a OutputSurface: OutputSurface.renderChildren().
This will need to get modified for per-object post-processing.

Minor