Changes

Implement modifier traits

This is a very powerful hook that allows a modifier to add additional modifiers to the tool. Example usecases:
* Add a modifier with special usages as an effect of a custom modifier, e.g. reinforced
* Add an internal modifier to run part of a modifier with a different priority
 Create a modifier that dynamically adds other modifiers under some conditions

Seems I forgot to check all the boxes on the autorenamer, that class used to be called state