Log through a GameLog autoload instead of print()

GameLog.debug() prints only in debug builds, and GameLog.warning() reports
problems such as unexpected server data or failed downloads.

playlist.gd

@@ -35,10 +35,10 @@ func song_is_answered(song_no: int = currently_playing_song) -> void:
 	# Nothing is playing yet (-1); a negative index would answer the last, unplayed song
 	if song_no < 0 || song_no >= song_object_array.size():
 		return
-	print("show_answer_pressed song_object: ", song_object_array[song_no]._to_string())
+	GameLog.debug("show_answer_pressed song_object: ", song_object_array[song_no]._to_string())
 	song_object_array[song_no].is_answered = true
 	if Settings.add_to_stats:
-		print("add to stats: ", song_no)
+		GameLog.debug("add to stats: ", song_no)
 		MusicServerClient.mark_song_played(song_no)
 
 func add_to_playlist(new_song_object: SongObject) -> void: