WIP
No more than 5 cpus. Bug in ddvt.
Add duration bench argument. Stop on SIGINT.
Fix phConstraintUpdate
Make flow particles static.
Solve trigger collisions
Add phAfterStep
Constrain particle aabb to ddvt's box
Update/improve emscripten build
Improve sdl raw input handling
Fix flow line creation
Centered Y gravity
Revert i < j optimization to j - i
Use phCreate for thread test data
Fix phBoxConstrainSmaller