enh: save metadata readouts from preproc, fix: access metadata readouts for QA, enh: selective ROI list for QA, fix: A/T compcor labels in QA

Metadata readouts are now saved in sink_dir if user chose to use metadata to specify TR and slice order, and QA workflow gets TR and slice order from metadata sink if metadata was used.  User can also now input to QA workflow a customized FreeSurferColorLUT.txt in order to limit the output in the TSNR table to a more selective list of ROIs.  A/T compcor typo in QA reports corrected.