Add BulletWorldImporter: it takes the in-memory data from BulletFileLoader and instantiates objects in a BulletDynamicsWorld.

Note that BulletFileLoader is has no dependencies on BulletDynamics/BulletCollision.
Also added a custom build step to copy asset (.bullet and .obj file) into the executable folder
Made a few 'char*' 'const char*' to avoid compiler warnings

Extras/Serialize/BulletFileLoader/CMakeLists.txt

@@ -14,6 +14,4 @@ bFile.cpp
 bFile.h
 btBulletFile.cpp 
 btBulletFile.h 
-btBulletFileLoader.cpp
-btBulletFileLoader.h
 )