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.tscn

@@ -9,6 +9,7 @@
 [ext_resource type="PackedScene" uid="uid://btupbowehiyyu" path="res://QRWindow.tscn" id="15_qr_window"]
 [ext_resource type="PackedScene" uid="uid://cp54idaudb8dp" path="res://AboutWindow.tscn" id="16_about_window"]
 [ext_resource type="Theme" path="res://popup_theme.tres" id="popup_theme"]
+[ext_resource type="PackedScene" uid="uid://bijh5h5yrivm3" path="res://Log.tscn" id="14_26rwn"]
 
 [node name="Control" type="Control" unique_id=407149696]
 layout_mode = 3
@@ -90,3 +91,11 @@ offset_top = 153.0
 offset_right = 720.0
 offset_bottom = 153.0
 
+[node name="Log" parent="." unique_id=1289881388 instance=ExtResource("14_26rwn")]
+unique_name_in_owner = true
+visible = false
+layout_mode = 1
+offset_left = 562.0
+offset_top = 132.0
+offset_right = 1262.0
+offset_bottom = 832.0