change lcpp Lua preprocessor, to keep #defines and comments, remove empty lines
remove duplicate data in b3Contact4 (now in btContact4Data shared between CPU/C++ and OpenCL)
OpenCL kernels use #include "Bullet3Collision/NarrowPhaseCollision/shared/b3Contact4Data.h"
Increase number of batches back to 250 (from 50), need to fix this hard coded number (see https://github.com/erwincoumans/bullet3/issues/12)
Work towards GJK/EPA, in addition to SAT/clipping (early on)
remove m_localPosA for now (it breaks NVIDIA OpenCL, copy of structs > 128 bytes)
contact normal should point from B to A (to be consistent with Bullet 2.x)
stringify: pre-allocate bigger buffer (10MB, workaround)