Added a model for the tool.

Assigned Collapser to slot 4.
Changed the operation feedback to be better inform the user what the tool did.
Instead of just showing how many joints were deleted, it now has 3 messages:
- If the tool did nothing because the limit was exceeded, then it will say that and show the size of what you clicked on.
- If the tool did nothing because there were no joints to delete, then it will tell you that.
- If the tool did remove joints, then it will tell you how many joints were deleted.

Fixed small recursion mistake causing some joints to be counted twice, leading to a slightly inaccurate count,

Fixed default values/controls not loading if options hadn't been opened yet

Initial Release