Add support for scenario 11

[rcjsuen]

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[rcjsuen]

Whoops, the above is wrong. This is scenario 11.

The walls never stop moving. Before the items are stolen, each time the sand timer is flipped, discard two revealed tiles that were already placed in the shopping mall.

In order to be able to discard a tile, it must meet the following requirements:

• It must have no Hero pawns and no Out of Order tokens on it.
• Tile 1 can never be removed from the mall.
• After the tile is discarded, it must still be possible to get everywhere in the shopping mall without using the Vortex spaces (i.e. so you can escape).

If you cannot remove two tiles without infringing upon these conditions, you lose the game.
Tuck the two discarded tiles face down under the deck. If the deck was already exhausted, these two tiles become the new deck.