2.86
fix many warnings remove btMultiSapBroadphase.* make collisionFilterGroup/collisionFilterMark int (instead of short int)
simple multi threading test
fix one more multi-threading issue
add example/MultiThreading functions
cmake Win32 fixes fixed some more warnings added alignment macros to some classes btPersistentManifold from 128 to 16 bytes aligned prepare command to select collision filter mode (SIM_PARAM_UPDATE_COLLISION_FILTER_MODE)
shrink down cube size of BasicDemo 10 times (it looked ginormous in VR) from 2x2x2 meter to 0.2 add test for VR HUD/sub-titles fix issue in previous commit, partial string use %.8s not %8.s use long long int in b3Clock fix warning/error in pointer alignment in serialization Fix pybullet Windows compilation. (thanks to bkeys/https://github.com/bulletphysics/bullet3/pull/687)