Make .bullet serialization mode robust:

Deal with broken DNA serialization. Bullet 2.76 release revision 2035 - 2046 was broken, and this includes the Maya Dynamica plugin.
Added some workaround to deal with the broken .bullet files, instead of crashing.

Extras/Serialize/BulletFileLoader/autogenerated/bullet_Common.h

@@ -47,6 +47,7 @@ namespace Bullet {
     class btPositionAndRadius;
     class btMultiSphereShapeData;
     class btIntIndexData;
+    class btShortIntIndexData;
     class btShortIntIndexTripletData;
     class btMeshPartData;
     class btStridingMeshInterfaceData;