- fixed screen flicker
- fixed crash on screen minimize
- improved win detection

- implemented IsBoardSolved for Sudoku
- made TileInput virtual since Minesweeper does not use this
- added Minesweeper comments

- TileClick and TileInput are now bool that return True if board is solved after input, false otherwise (so invalid or incomplete)
- virtual IsBoardSolved is called by TileClick and TileInput to verify board.
- removed some unused Board methods and added virtual hint method
- fixed impossible 4x4 sudoku generation
- improved solvability of sudoku
- changed draw method of sudoku to draw color givens and inputs differently
- hidden updatebutton
- added win method in puzzleform that runs when board is solved

- Fixed flickering when redrawing board by using BufferedGraphics
- Board is no longer marked as an optional parameter in PuzzleForm constructor
- UI appearance/layout changes
- GetTile method that returns board coordinates that touch a certain point (no longer static)
- Key/Mouse presses made will activate certain functions, including inputs to boardState (only if mouse touching board)
- Added input-handling abstract methods TileInput and TileClick to Board class

/ still missing solution for board not updating visually when boardState changes
/ solved 2 bugs by maximizing PuzzleForm window on start, removing this will make the bugs return
/ there is still at least one scenario where the input detection dies

- Fixed board not updating/drawing on start
- Fixed pixel offsets and nonsquare tiles with FitBoard method

ook die abstracte board classe verder gedaan