[Rendering] Harmonize head and orientation tracking

Parsing of headtracking file was harmonized to use the file specified by the -T option at the decoder.

Orientation tracking currently always defaults to REF mode. In CREND, Yaw/Pitch/Roll parameters are converted from Quaternions or fed from Euler angle data present in the file but not subsequently applied for signal modification. Other renderers do not support/use the hTrack orientation tracking handle.