Get rid of EvtPatches.hh
Summary: This gets rid of the EvtPatches. Related with !24.
Test Plan:
All tests are invariant under these changes. See results in
/home/epp/phsgfz/workingDirectory/RemoveEvtPatches/install/share/EvtGen/test/plots/*Pul*.
Reviewers: tlatham, kreps, jback
Reviewed By: jback
Tags: #evtgen
Differential Revision: https://phab.hepforge.org/D123