Distorted Android

Some speedup in CubesGrid

Fix a long-standing buf in CubesGrid (incorrect Grid in case of 5x5 11111 11011 10101 11011 11111)

Various relatively minor cleanups.

1. (hopefully) finish the 'Save' app (now we can adjust the size of the resulting file)
2. Fix one long-standing bug in almost every single app.

Move the 'Save' app to using a DistortedFramebuffer.

Improvements for DFramebuffer.

Fix the 'Save' app so that the saving thread does not run all the time in a tight loop

Javadoc

Fix with Projection

Turn the former 'FOV' app into 'Projection' app that also checks the (x,y) the camera looks at.