Tcga metadata update

This has been declared an emergency by dlarson in AT-486, so a rapid code review is requested please!

This is an update to the TCGA submission metadata for target_region_set_name. There is a lot of hardcoded information still, but the code is now more flexible because 'capture1 + capture2' no longer needs to be a separate entry from 'capture1' and 'capture2'. Everything is automatically aggregated, assuming a '+' delimiter in our model target_region_set_name.

See https://jira.gsc.wustl.edu/browse/AT-486
Maybe Allison or Mike can answer this.