enum Move changed to enum class Move and is not outside TetrisBoard.
Updated class RawTetrisBoard.
class TetrisBoard is now derived from class RawTetrisBoard.
Faster ai calculations.
Due to use of RawTetrisBoard instead of TetrisBoard.
Fixed bugs in the Ai.
Holes in the rows and columns was calculated incorrectly.
Some changes to the ai parameters too.
Bug fix in tetrisboard.
External rows to be added was not cleared when restarting the game.
Maxlevel increased from 20 to 40.
Added choice to add computer players in network game.
Changed max level to 40.

And moved all NetworkEvent classes to own header file.
Simplified code in guiwindow.