Allow prep_delay to execute TargetListToCoords.py

Matthijs van der Wildrequested to merge
RAP-1069-TargetListToCoords into master

This MR removes some of the logic from prep_delay.cwl and moves it to TargetListToCoords.py. The reasoning being that the script can now operate independently of the workflow without loss of function, which may help facilitate testing.

The CWL file still integrates the script into the larger workflow.

Closes RAP-1069

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