Playback Controller: Fixed title bar updating

This change had several components. For one, the delay of the dispatch
was increased from 5 milliseconds to 50 milliseconds. Two, the post to
the notification center was included in the delayed dispatch, so that
retains the PlaylistEntry object. Finally, the playlistController's
currentEntry object is reassigned from the input PlaylistEntry object,
which facilitates all watchers which are observing that variable for
updates. This final step also retains self for the callback, which
should be fine, since it's a quick dispatch with a short delay.

Fixes #335

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Application/PlaybackController.m

@@ -709,10 +709,11 @@ - (void)audioPlayer:(AudioPlayer *)player pushInfo:(NSDictionary *)info toTrack:
 	[pe setMetadata:info];
 	[playlistView refreshTrack:pe];
 	// Delay the action until this function has returned to the audio thread
-	dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_MSEC), dispatch_get_main_queue(), ^{
+	dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 50 * NSEC_PER_MSEC), dispatch_get_main_queue(), ^{
+		self->playlistController.currentEntry = pe;
 		[self sendMetaData];
+		[[NSNotificationCenter defaultCenter] postNotificationName:CogPlaybackDidBeginNotficiation object:pe];
 	});
-	[[NSNotificationCenter defaultCenter] postNotificationName:CogPlaybackDidBeginNotficiation object:pe];
 }
 
 - (void)audioPlayer:(AudioPlayer *)player reportPlayCountForTrack:(id)userInfo {