Add advanced post processing

[atsb]

I've managed to merge the 'empros' fork with the latest YQ2 release, however it crashes on startup. There is a lot of code that was added into YQ2 that also depends on the renderer changes.. It took a full 12 hours yesterday to merge it all together and get it building.

I'll have to do tiny changes I think, smaller, more refined changes to add a few PostFX additions. It isn't easy because of how the empros fork was done (no care or attention to maintainability and terrible code habits).