Stubs for intro scene and slideshower control.

Slideshower.tscn

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+[gd_scene format=3 uid="uid://rcq5arl8mdes"]
+
+[node name="Slideshower" type="Control" unique_id=776393005]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="VBoxContainer" type="VBoxContainer" parent="." unique_id=1628447815]
+layout_mode = 0
+offset_right = 1282.0
+offset_bottom = 715.0
+
+[node name="Sprite2D" type="Sprite2D" parent="VBoxContainer" unique_id=1957522201]
+
+[node name="RichTextLabel" type="RichTextLabel" parent="VBoxContainer" unique_id=1168262970]
+layout_mode = 2
+text = "Test"