Objects no longer inherit from extra data class
"Controlled" harmful abstraction no longer exists
Introduced NiParticleModifier/NiParticleCollider abstractions
Extra data size reading moved into the base read() method
Use LRU modification to hold currently used items. Use RecastMesh binary
data for item key.
Store original pointer of btCollisionShape in user pointer to make available
it as an identifier within all duplicates. Use pointer to heights data array
for btHeightfieldTerrainShape.