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.

SearchWindow.gd

@@ -39,7 +39,7 @@ func close() -> void:
 	super()
 
 func search() -> void:
-	print(search_bar.text)
+	GameLog.debug(search_bar.text)
 	var search_text: String = search_bar.text
 	
 	if search_text == "":
@@ -153,7 +153,7 @@ func check_if_soundtrack_exists(soundtrack: String) -> bool:
 	return soundtrack_exists
 
 func get_list_of_soundtracks() -> void:
-	print("get_list_of_soundtracks")
+	GameLog.debug("get_list_of_soundtracks")
 	var handle_soundtracks: Callable = func handle_soundtracks(array) -> void:
 		if typeof(array) == TYPE_ARRAY:
 			# Reuse existing labels: hide all and add to pool
@@ -164,7 +164,7 @@ func get_list_of_soundtracks() -> void:
 			for soundtrack: String in soundtracks:
 				add_soundtrack_reuse(soundtrack)
 		else:
-			print("Unexpected data")
+			GameLog.warning("Unexpected data")
 	MusicServerClient.fetch_all_soundtracks_ordered(handle_soundtracks)
 
 ## Replaces the searchable soundtracks and precomputes their search forms.