Hotfix "Stack".1

The following things have been changed:

• Fixed a bug where undoing through a level transition would put the player on the wrong tile.
• Fixed a bug where an object would sometimes be misplaced for one level state after an undo unstacked it.
• Fixed a bug where buttons would sometimes be pressed after an undo stacked it on top op something else.
• Fixed a bug where the player was being put on the wrong tile when loading "More Doors".
• Fixed a bug where a certain level did not load properly.