[Behaviours] [Breaking] Move files from bt/skills into bt/* subfolders according to their category

Feature Request

Summary

As we begin to scale up the number of mechanics, skills, tactics, behaviors, and plays, having them all in one folder is hard to keep track of.

Will need to fix tests.

Acceptance Criteria

• Mechanics are in bt/mechanics
• Skills are in bt/skills
• Tactics are in bt/tactics
• Plays are in bt/plays
• Tests reflect this folder structure as well

Design / Technical Approach

Dependencies

Testing Plan

• Write unit tests for feat