TrackClip moved to TimeShiftHandle; Snap doesn't use Track subclasses

src/Snap.cpp

@@ -16,29 +16,14 @@
 
 #include "Project.h"
 #include "ProjectSettings.h"
-#include "LabelTrack.h"
-#include "NoteTrack.h"
-#include "WaveClip.h"
+#include "Track.h"
 #include "ViewInfo.h"
-#include "WaveTrack.h"
 
 inline bool operator < (SnapPoint s1, SnapPoint s2)
 {
    return s1.t < s2.t;
 }
 
-TrackClip::TrackClip(Track *t, WaveClip *c)
-{
-   track = origTrack = t;
-   dstTrack = NULL;
-   clip = c;
-}
-
-TrackClip::~TrackClip()
-{
-
-}
-
 SnapManager::SnapManager(const AudacityProject &project,
                          SnapPointArray candidates,
                          const ZoomInfo &zoomInfo,