Blender Git Loki

Fix T73842: UI: add cloth collision settings to Hair Dynamics panel

Since hair collisions were integrated with the cloth solver
(rBd42a7bbd6ea5), there are a couple of relevant settings which were not
exposed to the User:
- Collision Quality
- Minimum Distance (this was reported in T73842, default of 0.015m was
still limiting in certain scenarios - this can now be made smaller)
- Impulse clamping
- Collision collection

This will add a 'Collisions' panel to Hair Dynamics with those settings

Note: in contrast to 'real' cloth, self-collisions are not supported for
hair

Maniphest Tasks: T73842

Differential Revision: https://developer.blender.org/D7032