Remove old and unused project settings, update various demos for 4.2 (#1024)

- Move all demo projects that don't require Forward+/Mobile-only features
  to the Compatibility rendering method. This improves performance significantly
  on low-end devices and ensures visuals are identical to a web export
  of the demo.
- Set deadzone on all inputs to 0.2 for better gamepad usability.
- Remove reliance on `default_env.tres` to use built-in Environment
  resources in the main scene instead (which follows the preview environment
  workflow).
- Remove notices pointing to GDNative or VisualScript, since both were
  removed in 4.0.
- Various bug fixes and usability tweaks to 10+ demos.

plugins/addons/material_creator/material_creator.gd

@@ -16,27 +16,27 @@ func _ready():
 
 
 func save_pressed():
-	get_node(^"SaveMaterialDialog").popup_centered()
+	get_node(^"SaveMaterialDialog").popup_centered_ratio()
 
 
 func load_pressed():
-	get_node(^"LoadMaterialDialog").popup_centered()
+	get_node(^"LoadMaterialDialog").popup_centered_ratio()
 
 
 func apply_pressed():
 	# Using the passed in editor interface, get the selected nodes in the editor.
 	var editor_selection = editor_interface.get_selection()
 	var selected_nodes = editor_selection.get_selected_nodes()
-	if selected_nodes.size() == 0:
-		printerr("Material Creator: Can't apply the material, because there are no nodes selected!")
+	if selected_nodes.is_empty():
+		push_error("Material Creator: Can't apply the material, because there are no nodes selected!")
 
 	var material = _silly_resource_from_values().make_material()
-	# Go through the selected nodes and see if they have the "set_surface_material"
+	# Go through the selected nodes and see if they have the "set_surface_override_material"
 	# function (which only MeshInstance3D has by default). If they do, then set the material
 	# to the silly material.
 	for node in selected_nodes:
-		if node.has_method("set_surface_material"):
-			node.set_surface_material(0, material)
+		if node.has_method("set_surface_override_material"):
+			node.set_surface_override_material(0, material)
 
 
 func save_file_selected(path):

plugins/addons/material_creator/material_dock.tscn

@@ -2,13 +2,13 @@
 
 [ext_resource type="Script" path="res://addons/material_creator/material_creator.gd" id="1"]
 
-[node name="Material Creator Plugin" type="Panel"]
+[node name="Material Creator" type="Panel"]
 offset_right = 220.0
 offset_bottom = 340.0
 script = ExtResource("1")
 
 [node name="VBoxContainer" type="VBoxContainer" parent="."]
-anchors_preset = 13
+layout_mode = 0
 anchor_left = 0.5
 anchor_right = 0.5
 anchor_bottom = 1.0
@@ -17,77 +17,53 @@ offset_right = 100.0
 grow_horizontal = 2
 grow_vertical = 2
 
-[node name="DockName" type="Label" parent="VBoxContainer"]
-offset_right = 200.0
-offset_bottom = 26.0
-text = "Material creator"
-
 [node name="AlbedoLabel" type="Label" parent="VBoxContainer"]
-offset_top = 30.0
-offset_right = 200.0
-offset_bottom = 56.0
-text = "Albedo color"
+layout_mode = 2
+text = "Albedo Color:"
 
 [node name="AlbedoColorPicker" type="ColorPickerButton" parent="VBoxContainer"]
-offset_top = 60.0
-offset_right = 200.0
-offset_bottom = 68.0
+custom_minimum_size = Vector2(0, 32)
+layout_mode = 2
 color = Color(1, 1, 1, 1)
 
 [node name="MetallicLabel" type="Label" parent="VBoxContainer"]
-offset_top = 72.0
-offset_right = 200.0
-offset_bottom = 98.0
-text = "Metallic strength"
+layout_mode = 2
+text = "Metallic Strength:"
 
 [node name="MetallicSlider" type="HSlider" parent="VBoxContainer"]
-offset_top = 102.0
-offset_right = 200.0
-offset_bottom = 118.0
+layout_mode = 2
 max_value = 1.0
 step = 0.05
 
 [node name="RoughnessLabel" type="Label" parent="VBoxContainer"]
-offset_top = 122.0
-offset_right = 200.0
-offset_bottom = 148.0
-text = "Roughness strength"
+layout_mode = 2
+text = "Roughness Strength:"
 
 [node name="RoughnessSlider" type="HSlider" parent="VBoxContainer"]
-offset_top = 152.0
-offset_right = 200.0
-offset_bottom = 168.0
+layout_mode = 2
 max_value = 1.0
 step = 0.05
 ticks_on_borders = true
 
 [node name="HSeparator" type="HSeparator" parent="VBoxContainer"]
-offset_top = 172.0
-offset_right = 200.0
-offset_bottom = 176.0
+layout_mode = 2
 
 [node name="ApplyButton" type="Button" parent="VBoxContainer"]
-offset_top = 180.0
-offset_right = 200.0
-offset_bottom = 211.0
-text = "Apply material"
+layout_mode = 2
+text = "Apply Material"
 
 [node name="SaveButton" type="Button" parent="VBoxContainer"]
-offset_top = 215.0
-offset_right = 200.0
-offset_bottom = 246.0
-text = "Save material"
+layout_mode = 2
+text = "Save Material"
 
 [node name="LoadButton" type="Button" parent="VBoxContainer"]
-offset_top = 250.0
-offset_right = 200.0
-offset_bottom = 281.0
-text = "Load material"
+layout_mode = 2
+text = "Load Material"
 clip_text = true
 
 [node name="Label" type="Label" parent="VBoxContainer/LoadButton"]
 visible = false
-anchors_preset = 15
+layout_mode = 0
 anchor_right = 1.0
 anchor_bottom = 1.0
 offset_bottom = -10.0