Add unpackers for MCHits to config as well as a test that runs all of them
This adds all the MCHit
unpackers to the mc_unpackers()
helper in Moore such that people can more easily use these.
I've added a simple test that just runs all of the defined unpackers over a few events.
Not 100% sure about where the file mc_run_unpackers.py
should live. For now placed it where I thought it makes the most sense to me.