Fix broken CDTestFramework

Avoid crash in BulletWorldImporter, ignoring 'invalid' constraints between two static bodies
Use a bitfield for btCollisionObject::CollisionObjectTypes (to allow custom types that are derived from build-in types such as btRigidBody)
Revert/improve softbody debug rendering

Extras/Serialize/BulletWorldImporter/btBulletWorldImporter.cpp

@@ -684,6 +684,8 @@ bool	btBulletWorldImporter::convertAllObjects(  bParse::btBulletFile* bulletFile
 			if (!rbB)
 				rbB = &getFixedBody();
 		}
+		if (!rbA && !rbB)
+			continue;
 				
 		btTypedConstraint* constraint = 0;