Minor changes for 0.2 tag

addons/procedural_material/main_window.tscn

@@ -4,7 +4,7 @@
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 [ext_resource path="res://addons/procedural_material/preview.tscn" type="PackedScene" id=3]
 
-[node name="MainWindow" type="Panel"]
+[node name="MainWindow" type="Panel" index="0"]
 
 anchor_left = 0.0
 anchor_top = 0.0

examples/stone_wall.ptex

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examples/wooden_floor.ptex

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project.godot

@@ -10,7 +10,7 @@ config_version=3
 
 [application]
 
-config/name="Material Lab"
+config/name="Material Maker"
 run/main_scene="res://addons/procedural_material/main_window.tscn"
 config/use_custom_user_dir=true
 config/custom_user_dir_name="material_maker"