Interaction - Battlefields: Monarch Linn, La Vaule, Riverne B01

[claywar]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• 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 the following battlefields to Interaction framework:

• Storms of Fate
• The Savage
• Ancient Vows
• Purple, The New Black

Also removes additional unused BCNM code, separates Spatial Displacement NPCs in Monarch Linn, and corrects Bahamut spawn position.

Steps to test these changes

Enter/win/exit/lose the above battlefields