Debug logging: Added logging of playback and tags

Added a logging method that indicates starting playback of a given URL,
and added a debug build only logging of every metadata load event.

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

Audio/AudioPlayer.m

@@ -65,6 +65,8 @@
 
 - (void)play:(NSURL *)url withUserInfo:(id)userInfo withRGInfo:(NSDictionary *)rgi startPaused:(BOOL)paused andSeekTo:(double)time
 {
+    ALog(@"Opening file for playback: %@ at seek offset %f%@", url, time, (paused) ? @", starting paused" : @"");
+    
     [self waitUntilCallbacksExit];
     output = nil;
     output = [[OutputNode alloc] initWithController:self previous:nil];

Playlist/PlaylistLoader.m

@@ -618,6 +618,8 @@ static inline void dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_bloc
                 progress += progressstep;
                 [weakLock unlock];
                 
+                DLog(@"Loading metadata for %@", weakPe.URL);
+                
                 NSMutableDictionary *entryInfo = [NSMutableDictionary dictionaryWithCapacity:32];
 
                 NSDictionary *entryProperties = [AudioPropertiesReader propertiesForURL:weakPe.URL];
@@ -700,6 +702,8 @@ static inline void dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_bloc
     {
         PlaylistEntry *pe = [entries objectAtIndex:idx];
 
+        DLog(@"Loading metadata for %@", pe.URL);
+
         NSMutableDictionary *entryInfo = [NSMutableDictionary dictionaryWithCapacity:32];
 
         NSDictionary *entryProperties = [AudioPropertiesReader propertiesForURL:pe.URL];