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.

MainWindow.gd

@@ -41,7 +41,7 @@ var popup_backdrop: PopupBackdrop
 func _ready() -> void:
 	popup_backdrop = PopupBackdrop.add_to(self, _popups())
 	if OS.has_feature("macos"):
-		print("is_mac")
+		GameLog.debug("is_mac")
 	top_bar.search_pressed.connect(show_search)
 	top_bar.sync_pressed.connect(sync_soundtracks)
 	top_bar.statistics_pressed.connect(get_statistics)
@@ -60,7 +60,7 @@ func _ready() -> void:
 func _input(event: InputEvent) -> void:
 	if event is InputEventKey and event.pressed:
 		if event.alt_pressed && event.keycode == KEY_ENTER:
-			print("Alt + Enter pressed")
+			GameLog.debug("Alt + Enter pressed")
 			Settings.fullscreen = !Settings.fullscreen
 			if Settings.fullscreen == true:
 				DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_FULLSCREEN)
@@ -77,44 +77,44 @@ func _popups() -> Array[PopupWindow]:
 
 
 func show_search() -> void:
-	print("show_search")
+	GameLog.debug("show_search")
 	search_view.toggle()
 
 
 func show_about() -> void:
-	print("show_about")
+	GameLog.debug("show_about")
 	about_window.open()
 
 
 func show_shortcuts() -> void:
-	print("show_shortcuts")
+	GameLog.debug("show_shortcuts")
 	shortcuts_window.open()
 
 
 func show_qr() -> void:
-	print("show_qr")
+	GameLog.debug("show_qr")
 	qr_window.open()
 
 
 func get_statistics() -> void:
-	print("get_statistics")
+	GameLog.debug("get_statistics")
 	statistic_popup.visible = true
 	statistic_label.text = "Total amount of soundtracks in the playlist: " \
 			+ str(search_view.soundtracks.size())
 
 
 func sync_soundtracks() -> void:
-	print("sync_soundtracks")
+	GameLog.debug("sync_soundtracks")
 	sync_window.start_sync()
 
 
 func _on_sync_started() -> void:
-	print("_on_sync_started")
+	GameLog.debug("_on_sync_started")
 	top_bar.sync_button.disabled = false
 	quiz.lock_for_sync()
 
 
 func _on_sync_finished() -> void:
-	print("_on_sync_finished")
+	GameLog.debug("_on_sync_finished")
 	search_view.get_list_of_soundtracks()
 	quiz.on_sync_finished()