refactor to state machine

scripts/states/run.gd

@@ -0,0 +1,28 @@
+extends State
+
+func process_physics(delta: float) -> State:
+	if not multiplayer.is_server():
+		return
+
+	var input_direction = %Input.direction
+	if input_direction.length() < 0.05:
+		return %Idle
+
+	var move_direction = Vector3(input_direction.x, 0, input_direction.y)
+	var target_velocity = Vector3(move_direction.x * subject.run_speed, subject.velocity.y, move_direction.z * subject.run_speed)
+	subject.velocity = subject.velocity.move_toward(target_velocity, subject.acceleration * delta)
+	subject.velocity += Main.gravity_velocity
+	subject.move_and_slide()
+
+	if move_direction.length() >= 0.1:
+		subject.last_direction = move_direction
+		var target_angle := Vector3.FORWARD.signed_angle_to(subject.last_direction, Vector3.UP)
+		subject.skin.global_rotation.y = lerp_angle(subject.skin.rotation.y, target_angle, subject.rotation_speed * delta)
+
+	if %Input.walking:
+		return %Walk
+
+	if not subject.is_on_floor():
+		return %Fall
+
+	return