- Add FindBehaviorSlotByEquipLocation method to map equipLocation strings to BehaviorSlot enum
- Update AddItemSkills and RemoveItemSkills to use equipLocation instead of itemType
- This fixes issue where items with same skill but different equipLocations would conflict
- Add unit tests to verify the new behavior
- Based on issue #1339: Server doesn't allow same skill in multiple slots
Co-authored-by: aronwk-aaron <26027722+aronwk-aaron@users.noreply.github.com>