Move the log popup to the main window

The quiz reports point changes with an event_logged signal, and the main
window adds them to the log. Alt+L is handled by the main window.

MainWindow.gd

@@ -25,6 +25,9 @@ var qr_window: Control = %QRWindow
 @onready
 var about_window: Control = %AboutWindow
 
+@onready
+var log_window: Control = %Log
+
 @onready
 var statistic_popup: PopupPanel = $StatisticsPopupPanel
 
@@ -49,6 +52,7 @@ func _ready() -> void:
 	sync_window.connect("sync_started", _on_sync_started)
 	sync_window.connect("sync_finished", _on_sync_finished)
 	quiz.server_changed.connect(search_view.get_list_of_soundtracks)
+	quiz.event_logged.connect(log_window.add_log_row)
 
 	search_view.get_list_of_soundtracks()
 
@@ -64,10 +68,12 @@ func _input(event: InputEvent) -> void:
 				DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_WINDOWED)
 		if event.alt_pressed && event.keycode == KEY_K:
 			shortcuts_window.toggle()
+		if event.alt_pressed && event.keycode == KEY_L:
+			log_window.toggle()
 
 
 func _popups() -> Array[PopupWindow]:
-	return [search_view, sync_window, qr_window, shortcuts_window, about_window]
+	return [search_view, sync_window, qr_window, shortcuts_window, about_window, log_window]
 
 
 func show_search() -> void: