macosx: set VLCMain as file owner for mainwindow and add outlets for window and playlist

Fixes playlist initialization.

modules/gui/macosx/intf.h

@@ -105,7 +105,7 @@ struct intf_sys_t
     BOOL b_active_videoplayback;
     BOOL b_nativeFullscreenMode;
 
-    VLCMainWindow *o_mainwindow;            /* VLCMainWindow */
+    IBOutlet VLCMainWindow *o_mainwindow;            /* VLCMainWindow */
 
     IBOutlet VLCControls * o_controls;     /* VLCControls    */
     IBOutlet VLCPlaylist * o_playlist;     /* VLCPlaylist    */

modules/gui/macosx/intf.m

@@ -752,9 +752,7 @@ static VLCMain *_o_sharedMainInstance = nil;
     items_at_launch = p_playlist->p_local_category->i_children;
     PL_UNLOCK;
 
-    [NSBundle loadNibNamed:@"MainWindow" owner: NSApp];
-    o_playlist = [[VLCPlaylist alloc] init];
-    o_mainwindow = [[VLCMainWindow alloc] init];
+    [NSBundle loadNibNamed:@"MainWindow" owner: self];
     [o_mainwindow makeKeyAndOrderFront:nil];
 }
 
@@ -914,7 +912,6 @@ static VLCMain *_o_sharedMainInstance = nil;
 
     libvlc_Quit(p_intf->p_libvlc);
 
-    [o_mainwindow release];
     o_mainwindow = NULL;
 
     [self setIntf:nil];