* Add code-coverage make target and github actions workflow
* Upload coverage to coveralls
* Add coverage badge to readme
* Fix some test makefiles to correctly propagate flags
Taking in the latest er7_utils directory and adding it into Trick in the
same location it was as an external repository. Made one change to
the files_to_ICG.hh file in the repository to remove the CheckpointHelper
header files. Those go in the Trick files_to_ICG.hh file.
refs #180