Changes

Changed default hint timer to 60 seconds

Added command-line flag to set custom hint time or disable it entirely.  Setting hint time to 0 will disable hints.

Add '-- --hint=#' in the command line or as part of a windows shortcut; where # is the number of seconds you would like it to wait before shaking a matching pair of tiles.

Fixed a small bug where the mouse clicks on the far sides of the window, off the board, would select tiles.