Added block-art images inspired by Microsoft Minesweeper for welcome/splash,

wins and losses. Uses graphic.js library to display image file using special
fx, when available (graphic.js v1.82 or later).
Clear console aborted flag before displaying winners.
Fix bug when displaying winners of specific difficulty levels 2+, list was
limited to winners divided by 5, rather than displaying the full (e.g. top 20)
winners of that level.