Parent task to gather topics needed to get physics working in 2.8, mainly by updating physics systems to be copy-on-write aware.
** The point cache is not properly refresh on changes, toggling edit mode works around it.
* Hair Dynamics
** Does not update properly until changing frames.
* Dynamic Paint
** There is no feedback in the viewport. Previously you could see the paint in solid mode.
* Playback defaults to AV Sync now, which breaks physics caches. A solution to this should be found.
Porting physics mainly involves sharing the point cache between the original and COW object. This was already done for rigid body, cloth and smoke, look at the relevant commits for examples of how to do it. Besides the point cache there may be other unexpected bugs that need to be fixed for each system.