LINEDROP: Added demo of a game created in LambdaNative.

- The game is similar to Tetris and even more similar to Columns.
- Press up to swap the order of the falling squares, press left and right to move the falling piece.
- Squares are removed if they contain a path from an edge of the board to another spot along the edge.
- Try to spell your name in the board, if you make a pattern matching the current goal (the current letter in your name shown in the upper right), you get two points for each square involved, and the board is cleared.
- A help/instructions page may be added.