clean up file structure

player/projectile/player_projectile.gd

@@ -0,0 +1,28 @@
+class_name PlayerProjectile
+extends Area3D
+
+const SPEED := 20.
+var _initialized := false
+var velocity: Vector3
+var health: int = 1:
+	set(v):
+		health = v
+		if v == 0:
+			queue_free()
+
+func _ready() -> void:
+	body_entered.connect(func(body: Node3D):
+		if body.has_method("hit"):
+			body.hit(self)
+		health -= 1
+	)
+
+func init(dir: Vector3) -> void:
+	_initialized = true
+	velocity = dir * SPEED
+
+func _physics_process(delta: float) -> void:
+	position += velocity * delta
+
+func _process(_delta: float) -> void:
+	assert(_initialized)