Change Simple node scripts to instantiate themselves

To support users adding SimpleCharacter and SimpleScoring as nodes,
instead of as child scenes, add an _init function for each which loads
the appropriate scene file and instantiates it.

https://phabricator.endlessm.com/T35545

Author: dylanmccall

addons/block_code/simple_nodes/simple_character/_simple_character.gd

@@ -0,0 +1,8 @@
+@tool
+extends SimpleCharacter
+
+
+func _init():
+	# Disable the SimpleCharacter _init function. We expect this script is
+	# already bound to _simple_character.tscn.
+	pass

addons/block_code/simple_nodes/simple_character/simple_character.tscn renamed to addons/block_code/simple_nodes/simple_character/_simple_character.tscn

@@ -1,14 +1,14 @@
 [gd_scene load_steps=3 format=3 uid="uid://ddx1cd5q6t61o"]
 
-[ext_resource type="Script" path="res://addons/block_code/simple_nodes/simple_character/simple_character.gd" id="1_oqwef"]
+[ext_resource type="Script" path="res://addons/block_code/simple_nodes/simple_character/_simple_character.gd" id="1_idjqv"]
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_104qs"]
-size = Vector2(16, 16)
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_ffh0f"]
+size = Vector2(100, 100)
 
 [node name="SimpleCharacter" type="CharacterBody2D"]
-script = ExtResource("1_oqwef")
+script = ExtResource("1_idjqv")
 
 [node name="Sprite2D" type="Sprite2D" parent="."]
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="."]
-shape = SubResource("RectangleShape2D_104qs")
+shape = SubResource("RectangleShape2D_ffh0f")

addons/block_code/simple_nodes/simple_character/simple_character.gd

@@ -52,6 +52,16 @@ func on_gravity_changed(new_gravity):
 	gravity = new_gravity
 
 
+func _init():
+	if self.get_parent():
+		return
+
+	var node = preload("res://addons/block_code/simple_nodes/simple_character/_simple_character.tscn").instantiate() as Node
+	node.replace_by(self, true)
+	node.queue_free()
+	scene_file_path = ""
+
+
 func _ready():
 	add_to_group("affected_by_gravity")
 	simple_setup()

addons/block_code/simple_nodes/simple_scoring/_simple_scoring.gd

@@ -0,0 +1,8 @@
+@tool
+extends SimpleScoring
+
+
+func _init():
+	# Disable the SimpleScoring _init function. We expect this script is
+	# already bound to _simple_scoring.tscn.
+	pass

addons/block_code/simple_nodes/simple_scoring/simple_scoring.tscn renamed to addons/block_code/simple_nodes/simple_scoring/_simple_scoring.tscn

@@ -1,9 +1,9 @@
 [gd_scene load_steps=2 format=3 uid="uid://bis7afjjuwypq"]
 
-[ext_resource type="Script" path="res://addons/block_code/simple_nodes/simple_scoring/simple_scoring.gd" id="1_yyb01"]
+[ext_resource type="Script" path="res://addons/block_code/simple_nodes/simple_scoring/_simple_scoring.gd" id="1_lc5bg"]
 
 [node name="SimpleScoring" type="CanvasLayer" groups=["hud"]]
-script = ExtResource("1_yyb01")
+script = ExtResource("1_lc5bg")
 
 [node name="PlayerLeftScore" type="Label" parent="."]
 unique_name_in_owner = true

addons/block_code/simple_nodes/simple_scoring/simple_scoring.gd

@@ -19,6 +19,17 @@ const _POSITIONS_FOR_PLAYER = {
 }
 
 
+func _init():
+	if self.get_parent():
+		return
+
+	var node = preload("res://addons/block_code/simple_nodes/simple_scoring/_simple_scoring.tscn").instantiate() as Node
+	node.replace_by(self, true)
+	node.queue_free()
+	print_tree_pretty()
+	scene_file_path = ""
+
+
 func get_custom_class():
 	return "SimpleScoring"