Yet anohter update!

This time, general improvements on piece movement and game mechanics in general. Now, pieces give priority on moves that take enemy pieces. Endgame now is achieved when finishing all pieces or taking down the king, player can now lose and is presented with a nice Defeat Screen.

Next update should take a little longer, since the next step is implementing the more complex algorithm. As sugessted, perhaps if possible make some magic integration with existing chess engines.