New board: Turm
New card: Stamp
getAdjacentEmptyTiles() now gets 4 tiles as it should. Previous code for 8
 adjacent tiles has been moved to getPossibleKingMoves(), currently unused
Fixed Vase and Ruler getting the wrong bonus for player 3 and 4
Temporarily modified Lace fan and Broom to check for immovable cards according
 their ID instead checking for a real immovable status
Temporarily modified the Stamp cfg file to match the 4x4 board balance
Corrected missing text in the cfg file of the Sponge