Filter: Add Vector2f option to notch filter

libraries/Filter/NotchFilter.cpp

@@ -146,4 +146,5 @@ NotchFilterParams::NotchFilterParams(void)
    instantiate template classes
  */
 template class NotchFilter<float>;
+template class NotchFilter<Vector2f>;
 template class NotchFilter<Vector3f>;

libraries/Filter/NotchFilter.h

@@ -66,5 +66,6 @@ protected:
 };
 
 typedef NotchFilter<float> NotchFilterFloat;
+typedef NotchFilter<Vector2f> NotchFilterVector2f;
 typedef NotchFilter<Vector3f> NotchFilterVector3f;