game: add magnet pickup

scenes/player.gd

@@ -111,8 +111,10 @@ func _trigger_level_up() -> void:
 	main_ui.level_up_ui.visible = true
 
 func _on_pickup_area_area_entered(area: Area2D) -> void:
-	var body: XPOrb = area.get_parent()
+	var body: Node2D = area.get_parent()
 	if body.is_in_group(GlobalConst.GROUP_XP_ORB):
 		add_xp(body.value)
 		GlobalConst.sig_debug_stats_set.emit("player_xp", "%s" % player_stats.current_xp)
 		body.queue_free()
+	elif body.is_in_group(GlobalConst.GROUP_PICKUP):
+		body.pickup()