Interaction - Battlefields: Stellar Fulcrum

[claywar]

I affirm:

• [x] I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• [x] I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• [x] I have read and understood the Contributing Guide and the Code of Conduct.
• [x] I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

• Converts Stellar Fulcrum battlefield "Return to Delkfutt's Tower" to interaction framework
• Removes deprecated code that existed in bcnm entrances and exits

Steps to test these changes

Enter/win/exit/lose battlefield