Separate animation layer

[Jameskmonger]

Add a pieceAnimations entry to BoardState and update this separately

This part in takePieceTurn is not great

        const attacker: PieceModel = {
            ...board.pieces[pieceId],
            attacking: null,
            hit: null,
        };

Rather than applying animation classes directly to the piece components, create separate PieceAnimationWrapper components and use those to select animations from stores