Added IK Spline Rig to the hair
This makes posing Frieren's hair much easier
There's still a bit more changes I want to make to Frieren's hair until I'm happy with it. Currently, when the hair is not sitting on her body, you have to activate the Hair Volume option in MustardUI under the Hair tab to make the hair look more natural and unbent. I'm still trying to find a better and more intuitive method for dealing with this issue.
Aside from that, I just need to add a few more outfits to the model and then it will be ready for the public release.