Adam Barth 7d5f172a26 Remove Force and SpringForce (#7532)
The only client of this machinery was AnimationController.fling, but
it's easier for that function to just create the simulation it needs
directly.

Fixes #7216
2017-01-18 16:32:00 -08:00
..
2016-11-27 07:46:54 -08:00