Castling remove gates #26
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https://github.com/ianfab/Fairy-Stockfish/blob/master/src/position.cpp#L1300 is wrong because when we are doing a castling move gates can't be set on
tosquare if it's a standard game.If it's a Chess960 castling (king takes rook) the gates on
tosquare may or may not be set depending on if we have something in hand to gate or not.On the other side castling rook
fromsquare have to be cleared in gates.