21.0.0

• Made numerous breaking changes to the native API.
• Deleted the (deprecated) DebugMeshCallback class. (API change)
• Bugfix: JVM crash while serializing BoundingValueHierarchy (Minie issue 41)
• Added the new CollisionConfiguration class and related methods:
  • CollisionSpace.getConfiguration()
  • PhysicsDescriber.describe(CollisionConfiguration)
  • a 5-argument CollisionSpace constructor
  • a 4-argument PhysicsSoftSpace constructor
  • a pair of 5-argument PhysicsSpace constructors
• Added 2 other public methods:
  • BoundingValueHierarchy.isCompressed()
  • MeshCollisionShape.getBvh()
• Improved the performance of contact filtering by adding an early return from FilteredInteriorCountCallback.
• Began building Android binaries using OpenJDK 11 (with Android Gradle plugin v7.4.0 and NDK v23.1.7779620) instead of JDK 8 (with Android Gradle plugin v4.2.2 and NDK v21.3.6528147).
• Began using htons() to configure byte swapping when serializing and deserializing a BoundingValueHierarchy. (This would be a breaking change for big-endian platforms, if any were supported!)
• Updated the Bullet sources to match SHA1 id=e9c461b0 of the bullet3 project, to add a test for constraint pass in btMultiBody.cpp. (Thanks to Ian Chen)