shrine

Pull request #1365: Feature/SHRINE2020 1350

Merge in SHRINE/shrine from feature/SHRINE2020-1350 to develop

* commit 'cc0b6507004419479705e60254797c01b2034cc7':
  Renamed BookEnd to EventBoundary for SHRINE2020-1350
  Mix of library dependencies was not playing nice with case objects for SHRINE2020-1350
  Found a very clean way to have case objects in the protocol for BookEnds for SHRINE2020-1350
  Needs an example for the javascript end SHRINE2020-1350
  Cleaned out some yellow flags for SHRINE2020-1350
  Marking future work in SHRINE2020-1350
  Fixed some tests for SHRINE2020-1350
  Intermediate check of SHRINE2020-1350