snake.icn: Program to play the snake game

    While away the idle moments watching the snake eat blank squares
on your screen.  Snake has only one (optional) argument -

    usage:  snake [character]

where "character" represents a single character to be used in drawing
the snake.  The default is an "o."  In order to run snake, your ter-
minal must have cursor movement capability, and must be able to do re-
verse video.

    I wrote this program to test itlib.icn, iscreen.icn, and some
miscellaneous utilities I wrote.  It clears the screen, moves the cur-
sor to arbitrary squares on the screen, changes video mode, and in
general exercises the terminal capability database on the target ma-
chine.
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Bugs:  Most magic cookie terminals just won't work.  Terminal really
needs reverse video (it will work without, but won't look as cute).