dsq followup work 1

fix animation export filename eroneous append
add ::canLoadCachedDSQ(const Torque::Path& path) methods to dae and assimp chains

SPECIAL NOTE:
as the above leads to dsqs not being previewable in editor, nor being able to understand they shouldn't be filtering out bones, for the block
         bool readSuccess = false;
         if (canLoadCached)
         {
            readSuccess = shape->read(&cachedStream);
         }
         else
         {
            readSuccess = shape->importSequences(&cachedStream, cachedPath);
         }
we'll be wanting to inject an armature proxy method to fill out          TSShape *shape = new TSShape;

untill such time as that's sorted, there's a bool gTryUseDSQs = false; killswitch in for dsqs

Engine/source/ts/loader/tsShapeLoader.cpp

@@ -40,6 +40,7 @@ MODULE_BEGIN( ShapeLoader )
    }
 MODULE_END;
 
+bool gTryUseDSQs = false;
 const F32 TSShapeLoader::DefaultTime = -1.0f;
 const F64 TSShapeLoader::MinFrameRate = 15.0f;
 const F64 TSShapeLoader::MaxFrameRate = 60.0f;