Distorted Android

Fix for Bug #16: When rotated at an angle, surfaces get increasingly transparent.

This also fixes the saturation, chroma, alpha + contrast effects, while completely breaking macroblocks :)

Fix for Bug #18: DISTORT effect: disappearing triangles

Fix for Bug 19: SWIRL effect: mess if Center out of Region.

revert latest changes to the fragment shader.
small things in DistortedObjects.

some improvements for the way we test DistortedObjects.

fix fragment effects :)

remove the 'Color' vertex attribute.

switch precision to low in fragment shader

Make the 'deform' effect continuous when 'center' point passes through (0,0) i.e. middle of the Object.

fix in vertex shader