* moved camera code from oclraster to pipeline and draw_state, extended it and added some documentation (multiple framebuffers with different camera setups, and custom camera setups in general are actually possible now!)
 * updated all samples accordingly (oclr_rtt does what it's supposed to do now -> added+use an additional camera when drawing into the rtt framebuffer)
 * fixed camera position uniform update in oclr_simple
 * removed a lot of unnecessary/unused code from the oclraster class (+some misc cleanup)
 * version bump