add option to perform filtering of 'getClosestPoints' using linkA/linkB. don't use 'realtimesimulation' as default add/remove debug items within same thread pybullet, report contact points and normal as [x,y,z] triplet/vector, not 3 scalars separate 'getClosestPointsAlgorithm': box-box doesn't report closest points with positive distance, and the query shouldn't impact regular 'closesst points'