Add choosing strategy with newrev support

[ctudor]

This is an update to #440 to build successfully on master. I added the unused field back for now in hopes this will get the code merged into the mainline code.

Testing done

Code has been built and installed locally on our production Jenkins servers with jobs configured to use the new build chooser strategy. I have been maintaining a local fork of changes and have been rebuilding and deploying manually with each new release.

### Submitter checklist
- [x] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [x] Link to relevant issues in GitHub or Jira
- [x] Link to relevant pull requests, esp. upstream and downstream changes
- [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[ctudor]

Any updates on how to get this change merged? Anything else I need to do?

[rsandell]

I still don't think this is needed.

Suggested change

	/**
	* Used by XStream for something.
	*/
	@SuppressWarnings("unused")
	private final String separator = "#";

[rsandell]

Well I have been waiting for my original review comments to be addressed?