[mod] unified processing of the reference vector modes with OTR_TRACKING_REF_ORIENT

haeusslerrequested to merge
109-harmonize-head-and-orientation-tracking-refvec-review into 109-harmonize-head-and-orientation-tracking
  • solves the issue that alpha did not get reset when switching from the ref-rotation modes to the ref-vec modes
  • simplifies the otr processing function

Related to #109

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