* chore: refactor state machine clone logic out as a separate class
* feat: add layer priority and relative path root options to Merge Animator
* feat: add Merge Blend Tree component
* chore: adjust NDMF dependency
* docs: update merge-animator docs
* docs: merge blend tree docs
* chore(i18n): initial integration with NDMF localization system
* feat(error): integrate with NDMF error reporting framework
Note that as part of this, the pre-build validation system has been disabled for now.
It didn't work very well with other NDMF plugins in the first place, so it's probably
for the best...
* chore: fix u2019 build errors
