Add direct rendering support for YCbCr (YUV) pixels
@christos.tsolakis, @sebastien.jourdain This MR completely offloads the YUV->RGB post-decode conversion to the GPU. It's useful in a desktop client and it doesn't have any practical use in a web-based client since the browsers take care of doing that conversion efficiently - like we do here.
Edited by Jaswant Panchumarti (Kitware)