grafx - Extensible Java Graphics Package Code

Adding HeadlessBoardAWTStub which is an interface that sits 'between'
CanvasAWTStub and BoardAWTStub; it excludes input events. Also adding a stub
for VideoRecorderAWTStub.

Modifying the hardest nightmare level a little bit.

Played a good game. Adding level23-game-3.blo.

Adding TODO.txt.

Played a great game.

Adding level23-game.blo.

Adding a single 7-er block to the offical list of blocks.

Increasing width of GameSidebar by 5px.

Getting rid of 'level' field in GameSidebar. Making adjustments with
NextBlockDisplay, in its placement and size.

Adding a 7-er test level.