SimpleSpawner: Add "rotate with parent" property

Add yet another setting to the SimpleSpawner. This is to rotate the
spawned scene according to the SimpleSpawner parent node. Useful for
changing the direction of bullets spawned from a rotated object.

addons/block_code/simple_spawner/simple_spawner.gd

@@ -34,6 +34,12 @@ enum LimitBehavior { REPLACE, NO_SPAWN }
 ## - No Spawn: No spawn happens until any spawned scene is removed by other means.
 @export var limit_behavior: LimitBehavior
 
+## Whether the scene being spawned is rotated according to the parent node:
+## - If the spawned scene is a RigidBody2D, the linear velocity and constant forces
+##   are rotated according to the parent node rotation.
+## - If the spawned scene is a Node2D, the rotation is copied from the parent node.
+@export var rotate_with_parent: bool = false
+
 var _timer: Timer
 var _spawned_scenes: Array[Node]
 
@@ -99,6 +105,12 @@ func spawn_once():
 	var scene: PackedScene = scenes.pick_random()
 	var spawned = scene.instantiate()
 	_spawned_scenes.push_back(spawned)
+	if rotate_with_parent and get_parent() and get_parent() is Node2D:
+		if spawned is RigidBody2D:
+			spawned.linear_velocity = spawned.linear_velocity.rotated(get_parent().rotation)
+			spawned.constant_force = spawned.constant_force.rotated(get_parent().rotation)
+		elif spawned is Node2D:
+			spawned.rotate(get_parent().rotation)
 	match spawn_parent:
 		SpawnParent.THIS:
 			add_child(spawned)