Few functions in ivas_orient_trk.c converted to fixed point

Functions converted:
[x]IdentityQuaternion
[x]ivas_orient_trk_SetTrackingType
[x]ivas_orient_trk_GetTrackedRotation
[x]ivas_orient_trk_GetMainOrientation
[x]Quaternion Normalise
[x]Quaternion Inverse
[x]VectorRotationToQuaternion
[x]ivas_orient_trk_SetReferenceVector