Revert "Removed unused reference"

This reverts commit 0cf6164ed3aa415d087fe9eaf90f7be926666efd.
Merge branch 'master' of https://github.com/machpavel/autickax
ShiftableGameObject class added and corrected inherition.
New stages in communicators are created. Booster minigame buttons not disposed bug  #Solves 149