* Implement R16S & R16UI & R16I RenderTargetFormats & PixelFormats
Do a separate function in order to get Bytes Per Pixel of DepthFormat
Apply the new function in gpu.h
delete unneeded white space
* correct merging error
We move the initialization of the renderer to the core class, while
keeping the creation of it and any other specifics in video_core. This
way we can ensure that the renderer is initialized and doesn't give
unfettered access to the renderer. This also makes dependencies on types
more explicit.
For example, the GPU class doesn't need to depend on the
existence of a renderer, it only needs to care about whether or not it
has a rasterizer, but since it was accessing the global variable, it was
also making the renderer a part of its dependency chain. By adjusting
the interface, we can get rid of this dependency.
