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.

tests/integration/test_scene_split.gd

@@ -6,7 +6,7 @@ extends MainWindowTestSuite
 
 const MAIN_WINDOW_CHILDREN: Array[String] = [
 	"TopBar", "Quiz", "PopupBackdrop", "Search", "SyncWindow", "QRWindow",
-	"ShortcutsWindow", "StatisticsPopupPanel", "AboutWindow",
+	"ShortcutsWindow", "StatisticsPopupPanel", "AboutWindow", "Log",
 ]
 
 const TOP_BAR_CHILDREN: Array[String] = [
@@ -130,7 +130,7 @@ func test_points_from_the_player_list_reach_the_song_and_log() -> void:
 	(_player_row(crono).get_node("HBoxContainer/AddPoint") as BaseButton).pressed.emit()
 
 	assert_array(Playlist.song_object_array[0].players_given_point).contains_exactly([crono.id])
-	assert_int((_quiz.get_node("%Log").get_node("%LogVBoxContainer") as Node).get_child_count()) \
+	assert_int((_window.get_node("%Log").get_node("%LogVBoxContainer") as Node).get_child_count()) \
 			.is_equal(1)
 
 
@@ -242,7 +242,7 @@ func test_alt_k_opens_shortcuts_and_alt_l_opens_log() -> void:
 	assert_bool((_window.get_node("ShortcutsWindow") as Control).visible).is_true()
 
 	await _press_keys([KEY_ALT, KEY_L])
-	assert_bool((_quiz.get_node("Log") as Control).visible).is_true()
+	assert_bool((_window.get_node("Log") as Control).visible).is_true()
 
 
 func test_alt_down_lowers_the_volume() -> void: