Finished refactoring of the basic game and integrated the new
chessfigures.
Fetures:
-undo/redo is now possible
-chessfigure movement
-chessfigure beating
-set another player check
-player change
-timer clocks
-drawing of chessboard, chessfigures and moves
Added the ChessFigure promotion, chessFigure factory plus some minor bug
fixes.
Modified class variables for a consistent code style.
Added the possibility to win and loose a game.
Merge branch 'feature-Chessboard_Game_refactoring' into develop