Skyrim materials, bhkRigidBody

1. Added three new unknown Skyrim havok materials found in Dawnguard DLC meshes.
2. A little change in bhkRigidBody. First two shorts of "Unknown 6 Shorts" changed to "Unknown 1 Int Copy" as this 4byte value is always same as "Unknown Int 1" - based on obvervations of Skyrim, Fallout 3 and Oblivion files.