this checks size for being an integer and that a shape is selected

Works, but I'm going to try using try:/except: in the shape read also.
The winsound code produces a "boop" sound on error
Checking the board size and type in Board.validate works

Beep sound works on bad parameter.  Next, open the board
selectBoard() transitions into the board when "Done" is pressed

made a function that clears the children from a window

TO-DO:
get cross working, add a backup button