Remove COGLColorCombiner2 and unused files

I suggest to check commits one by one. I try to make each commit do one specific things (the project can build between each commit) so it should be simpler this way.

In short:
- Remove the OGL 1.2 and 1.3
- Remove COGLColorCombiner2 (used by 1.2 and 1.3)
- Remove DirectX DecodedMux files (cpp and h) + a useless include.
- Remove CnvTNTCombiner files (cpp and h)
- Tiny "space reformatting" in config
- Update the config updater