Blender Git Commit Log

Replace plNearestPoints with a deticated solution

Implement a dedicated collision detection function (was previously
relying on Bullet's generic `plNearestPoints`).
This function computes all the collision data to be used for response:
coordinates, distance, direction vector.

This new function has three advantages:

* Remove a dependency from cloth simulation (Bullet).
* Give more pleasing collision results (this function is tailored
specifically for our collision response method).
* Much faster computation (not benchmarked extensively, but observed
overal simulation time was cut roughly in half with "collision-heavy"
simulations).