Summary: This gets rid of the EvtPatches. Related with [!24](https://gitlab.cern.ch/evtgen/evtgen/-/merge_requests/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