* extraced PlaylistListView into it's own files

* lots of changes, besically these make the Playlist window usable
  - drag sorting works (hold shift to copy instead of move items)
  - removing items with the delete key works
  - dragging files/folders from Tracker works (hold shift to insert
    them in the existing playlist, othewise the new files replace
    the playlist)
* some refactoring and bug fixes in previously unused functionality
* Playlist can now be locked (needed to be), and is in ControllerView,
  MainWin and PlaylistListView


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21305 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/mediaplayer/Controller.h

@@ -21,6 +21,7 @@
 #ifndef __CONTROLLER_H
 #define __CONTROLLER_H
 
+#include <Entry.h>
 #include <MediaDefs.h>
 #include <MediaNode.h>
 #include <List.h>
@@ -76,6 +77,7 @@ public:
 	void					Stop();
 	void					Play();
 	void					Pause();
+	void					TogglePlaying();
 
 	bool					IsPaused() const;
 	bool					IsStopped() const;
@@ -158,6 +160,7 @@ private:
 	volatile bool			fStopped;
 	float					fVolume;
 
+	entry_ref				fRef;
 	BMediaFile *			fMediaFile;
 BMediaTrack *			fAudioTrack;
 BMediaTrack *			fVideoTrack;