Move drawing code specific to Wave or to Note track controls...

... making cycles of some TrackControls subclasses with their handles, which
perhaps means those files should be fused, but that's for later

src/WaveTrack.cpp

@@ -3124,3 +3124,4 @@ void WaveTrack::DoZoom
    if( pProject )
       ProjectHistory::Get( *pProject ).ModifyState(true);
 }
+