simple_nodes: Add SimpleEnding node

This provides a label that displays either a win or lose message along
with blocks to set or clear the label during the game. Label is
inherited directly so that all the label properties are available in the
inspector.

We want the label to be empty when the scene is run, but there may be
text persisted in the scene file. When not in the editor, the text is
cleared when entering the scene tree. Normally this would be done in
_ready, but it's likely that gets replaced by a block script.

https://phabricator.endlessm.com/T35661

addons/block_code/simple_nodes/simple_ending/simple_ending.gd

@@ -0,0 +1,89 @@
+@tool
+class_name SimpleEnding
+extends Label
+
+const BlockDefinition = preload("res://addons/block_code/code_generation/block_definition.gd")
+const BlocksCatalog = preload("res://addons/block_code/code_generation/blocks_catalog.gd")
+const OptionData = preload("res://addons/block_code/code_generation/option_data.gd")
+const Types = preload("res://addons/block_code/types/types.gd")
+
+## The message that will be shown when the player wins the game.
+@export var win_message: String = "YOU WIN!"
+
+## The message that will be shown when the player loses the game.
+@export var lose_message: String = "GAME OVER"
+
+
+func game_over(result: String):
+	match result:
+		"WIN":
+			text = win_message
+		"LOSE":
+			text = lose_message
+		_:
+			text = ""
+			push_warning('Unrecognized game result "%s"' % result)
+
+
+func reset():
+	text = ""
+
+
+func _ready():
+	simple_setup()
+
+
+func simple_setup():
+	if not label_settings:
+		label_settings = LabelSettings.new()
+		label_settings.font_size = 200
+	horizontal_alignment = HorizontalAlignment.HORIZONTAL_ALIGNMENT_CENTER
+	vertical_alignment = VerticalAlignment.VERTICAL_ALIGNMENT_CENTER
+
+
+func _enter_tree():
+	# In the editor, show the win message so that adjusting the label
+	# properties is visible. Otherwise, clear the text when entering the tree
+	# so that the label text persisted in the scene file isn't shown.
+	#
+	# Normally this would be done in _ready, but a block script might override
+	# that and simple_setup is too late.
+	if Engine.is_editor_hint():
+		text = win_message
+	else:
+		text = ""
+
+
+func get_custom_class():
+	return "SimpleEnding"
+
+
+static func setup_custom_blocks():
+	var _class_name = "SimpleEnding"
+	var block_list: Array[BlockDefinition] = []
+	var block_definition: BlockDefinition
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simpleending_game_over"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Game"
+	block_definition.type = Types.BlockType.STATEMENT
+	block_definition.display_template = "game over {result: STRING}"
+	block_definition.code_template = "game_over({result})"
+	block_definition.defaults = {
+		"result": OptionData.new(["WIN", "LOSE"]),
+	}
+	block_definition.description = "Show the game over label with the win or lose message."
+	block_list.append(block_definition)
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simpleending_reset"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Game"
+	block_definition.type = Types.BlockType.STATEMENT
+	block_definition.display_template = "reset game over"
+	block_definition.code_template = "reset()"
+	block_definition.description = "Reset the game over label."
+	block_list.append(block_definition)
+
+	BlocksCatalog.add_custom_blocks(_class_name, block_list)

addons/block_code/ui/constants.gd

@@ -22,6 +22,11 @@ const BUILTIN_CATEGORIES_PROPS: Dictionary = {
 		"color": Color("ec3b59"),
 		"order": 10,
 	},
+	"Lifecycle | Game":
+	{
+		"color": Color("ec3b59"),
+		"order": 12,
+	},
 	"Lifecycle | Spawn":
 	{
 		"color": Color("ec3b59"),