Implementing dictionary operators

test/demo/main.tscn

@@ -6,15 +6,12 @@
 script = ExtResource( "1_c326s" )
 
 [node name="Example" type="Example" parent="."]
-script = null
 
 [node name="Label" type="Label" parent="Example"]
 offset_left = 194.0
 offset_top = -2.0
 offset_right = 234.0
 offset_bottom = 21.0
-structured_text_bidi_override_options = []
-script = null
 __meta__ = {
 "_edit_use_anchors_": false
 }
@@ -23,9 +20,6 @@ __meta__ = {
 offset_right = 79.0
 offset_bottom = 29.0
 text = "Click me!"
-script = null
 __meta__ = {
 "_edit_use_anchors_": false
 }
-
-[connection signal="custom_signal" from="Example" to="." method="_on_Example_custom_signal"]