MoreShaderWork: Warp shader, better integration

Added warp shader, using predefined normal sprites to paint visual
distortions into the final composition. Fast and effective. This will be
used in cloaking devices in the final program.

Lights now use DAGTransforms. The light shader is updated to cope with
rotated sprites, although this is currently unused. Animated "police
car" effects should now be quite possible. The light sprite was
resimulated (using renderout_lightStencil.pde) at a lower height to
better reflect the usage scenario.

Sprite updated to include alpha terms for all layers, and an additional
warp layer. In a pinch, a straight normal map can substitute for a
soft-edged warp sprite.

RenderManager still assumes default coordinates. Later implementations
may have to adapt coordinate systems somewhere in the pipeline.