Add hit state creation utility

[Pyxus]

Problem

Creating hit states can be kind of tedious since you have to manually create a composition of a few different nodes. Namely HitState -> Hitbox -> CollisionShape. You can duplicate an exiting composition but you then have to go through and manually make each shape reference unique to avoid interfering with the original composition.

Solution

A quick create menu could potentially be added which can assist the user in adding new states allowing them to set how many hitboxes a state will have, what their attributes are, and what collision shape they use. The utility could also support copying existing state compositions while automatically making the shape resources unique.