Add cap sprite to child scene and update project configuration

addons/guide/guide_set.gd

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+## Helper class for modelling sets
+var _values:Dictionary = {}
+
+func add(value:Variant) -> void:
+	_values[value] = value
+	
+	
+func remove(value:Variant) -> void:
+	_values.erase(value)
+	
+
+func clear() -> void:
+	_values.clear()
+	
+func is_empty() -> bool:
+	return _values.is_empty()
+	
+	
+func pull() -> Variant:
+	if is_empty():
+		return null
+	
+	var key = _values.keys()[0]
+	remove(key)
+	return key
+	
+	
+func has(value:Variant) -> bool:
+	return _values.has(value)
+
+## Returns the first item for which the given matcher function returns
+## a true value.
+func first_match(matcher:Callable) -> Variant:
+	for key in _values.keys():
+		if matcher.call(key):
+			return key
+	return null
+
+func values() -> Array:
+	return _values.keys()