Add projectile scaling workaround

Adds a workaround that manually scales the children of the Projectile
scene.
This is due to a problem where the projectile root node scale does not
propagate down to the sprite or collision shape within it.

godotengine/godot#5734

units/projectile.gd

@@ -10,7 +10,8 @@ func spawn(owner: Node, spawn_with_projectile_effects: Array[ProjectileEffect],
 	projectile_effects = spawn_with_projectile_effects
 	var local_transform = parent_transform
 	for effect in projectile_effects:
-		add_child(effect.instantiate())
+		add_child(effect)
+		effect.set_owner(self)
 		effect.modify_creation(owner, projectile_effects, local_transform)
 	# Spawn the default projectile
 	# TODO:: Projectile spawn modification may want to prevent the default from spawning
@@ -19,8 +20,19 @@ func spawn(owner: Node, spawn_with_projectile_effects: Array[ProjectileEffect],
 	projectile_effects = projectile_effects
 	transform = local_transform
 
+func scale_projectile(new_scale: Vector2):
+	$Sprite2D.scale = new_scale
+	$CollisionShape2D.scale = new_scale
+
+func _ready():
+	if scale != Vector2.ONE:
+		scale_projectile(scale)
+
 func _physics_process(delta):
 	var position_modifier = transform.x * SPEED * delta
 	for effect in projectile_effects:
 		position_modifier = effect.modify_physics(position_modifier)
 	set_position(position + position_modifier)
+
+func _integrate_forces(delta):
+	scale = Vector2(100, 100)