WT: store state names per object (like animation names)

[Joey79100]

State names are borrowed directly from TrCatalog.xml, just like animation names.

Animation names can be edited and saved in the object. States however, are not editable, they're in TrCatalog.xml and nothing else.

With TEN (and actually, even outside of TEN), people may create their own objects from scratch using the Animating slots. I mean objects with their own Lua script to control them, and state changes to handle the animations.

Saving the state names would be useful to keep track of the animation logic (and they'd have no place in TrCatalog.xml since they're specific). It could be a separate window in the Animation Editor (?), since it would be directly linked to an object.