Added:
- A new class called AMStorageRing that provides an API for handling
universal things like beam dumps.
- Implemented a CLS version that specifically uses the ring current and
SRStatus PV to provide beam availability.
Added:
- The new CLSStorageRing to the VESPERSAppController.

Removed:
- The ring current from the beamline class and removed some debugging
stuff from CLSStorageRing.
Added:
- isConnected() statement when requesting the ring current.
Added:
- The beam dump code to IDEAS, REIXS, and SGM.
Fixed merge conflicts.
Merge pull request #812 from acquaman/Issue660

Pull Request for Issue660: Acquaman Beam dump/fill handling
Merge branch 'master' into Issue860
Altered:
- Made the visual cues for bad regions in 2D and spatial line scans
actually work with new AMStepScanConfiguration getters.

Part of #860.
Merge branch 'Issue860' of github.com:acquaman/acquaman into Issue860