Removecrystalhd

This was discussed in the internal forum for years now and was timelined for helix. CrystalHD is not supported anymore and no dev is testing / running it.

As discussed and acked by @davilla the original author - I tried to pull out everything crystalhd related.

If and only if really someone wants to get back crystalhd support, we should use the ffmpeg hw accel for this, which is not on my list anywhere.