Tiles in tiles rack should be filled from tiles bag

[krystian1201]

When:

• at the beginning of game - DONE
• after each move
  • just as many as were put on board - DONE
  • tiles should be placed in correct (empty) places in tiles rack - DONE
• when tiles are exchanged - SUSPENDED
  • the tiles from board should go back to tiles bag
  • Let's suspend for now the exchange functionality