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to the rest of the Bullet code base. This code will replace the original GJK/EPA in a future commit. Added btMprPenetration, an implementation of Minkowski Portal Refinement by Daniel Fiser. Original MPR idea is by Gary Snethen, and the first implementation is here: https://github.com/erwincoumans/xenocollide It is an alternative to EPA, although computing the local penetration depth. EPA computes the global penetration depth. In many cases, MPR is sufficient and performs better than EPA.