Distorted Android

Properly compute the Halo of a queue of postprocess effects.

Minor.

Still small improvement to FPS

Correct the FPS work (now works even after a Pause() ! )

Move showing FPS in the uppoer-left corner of the Screen to the Library.
App can enable/disable this at any time with a single API call.

Beginnings of support for the GLOW effect.

Bugfix in renderChildren again :)

Bugfix in renderChildren (postprocess):

for each bucket, first render all the bucket members , only then render all of their Stencils+Depths (avoids this 'black ring' effect)

Minor.

Split up postprocessing into queue of effects + blit with depth.