Expose soft body links and remove Get/SetPosition from soft body API (soft bodies aren't at a single point!)
Test sparse sdf garbage collect after simulation
Calculate drag only if object has a nonzero velocity
Normalize the direction sent to GetDragInDirection
Update some soft body interface functions
Remove all soft bodies on environment destruction
Use btSolverBody instead in pre/postSolveContact
Fix GetLink/GetFace returning bad ids
Add Transform in softbody interface
CreateSoftBodyPatch
"Fix" an assert in btSparseSDF
Update the public interfaces
Expose soft body patches to lua
Whoops, forgot to implement soft body patches in the environment
Update vphysics project to include the 2 new interfaces