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.

audio/midi_piano/README.md

@@ -12,7 +12,7 @@ Note that MIDI output is not yet supported in Godot, only input works.
 
 Language: GDScript
 
-Renderer: GLES 2
+Renderer: Compatibility
 
 Check out this demo on the asset library: https://godotengine.org/asset-library/asset/1292
 

audio/midi_piano/piano.tscn

@@ -3,26 +3,20 @@
 [ext_resource type="Script" path="res://piano.gd" id="1"]
 
 [node name="Piano" type="ColorRect"]
+anchors_preset = 15
 anchor_right = 1.0
 anchor_bottom = 1.0
 color = Color(0, 0, 0, 1)
-script = ExtResource( "1" )
-__meta__ = {
-"_edit_use_anchors_": false
-}
+script = ExtResource("1")
 
 [node name="WhiteKeys" type="HBoxContainer" parent="."]
+layout_mode = 0
 anchor_right = 1.0
 anchor_bottom = 1.0
 mouse_filter = 2
-__meta__ = {
-"_edit_use_anchors_": false
-}
 
 [node name="BlackKeys" type="HBoxContainer" parent="."]
+layout_mode = 0
 anchor_right = 1.0
 anchor_bottom = 0.6
 mouse_filter = 2
-__meta__ = {
-"_edit_use_anchors_": false
-}

audio/midi_piano/project.godot

@@ -21,16 +21,7 @@ config/icon="res://icon.webp"
 window/size/viewport_width=1280
 window/size/viewport_height=200
 
-[network]
-
-limits/debugger_stdout/max_chars_per_second=2048000
-
-[physics]
-
-common/enable_pause_aware_picking=true
-
 [rendering]
 
-quality/driver/driver_name="GLES2"
-vram_compression/import_etc=true
-vram_compression/import_etc2=false
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"