changed piece sprites, changed UI elements

assets/fonts/m6x11.ttf

assets/fonts/m6x11.ttf.import

assets/noise/inside.tres

assets/noise/noise.tres

assets/noise/noise2.tres

assets/noise/noise3.tres

assets/noise/outside.tres

assets/sprites/assassin.png

assets/sprites/assassin.png.import

assets/sprites/bishop.png

assets/sprites/king.png

assets/sprites/king.png.import

assets/sprites/knight.png

assets/sprites/mage.png

assets/sprites/mage.png.import

assets/sprites/pawn.png

assets/sprites/queen.png

assets/sprites/queen.png.import

assets/sprites/rook.png

assets/sprites/tile.png