Rename DefaultFramebufferRT to NullRT and really do nothing.
Remove support for stencil buffers (doesn't work yet)
Add a method to prepare the stencil buffer for interlaced stereo rendering
Fix float formats and add the size of a single pixel in bytes to the format description
Add a method to get the number of bits per pixel of the color and depth buffer from the render target
Remove dependencies

Use a static function to create render targets. Allows the user to create and use CUDA render targets
without having the CUDA toolkit installed.