`-d` scheme now DEC Special Graphics Character Set
the double width character scheme was always intended for my VT220, not
another (subjectively worse) xterm mode) - therefore, I've replaced it
with the proprietary DEC charset.
TODO: add something to swich charset on beginning/exit
girst [Thu, 29 Jun 2017 22:47:52 +0000 (00:47 +0200)]
add restart game key, fix free()-segfault
if help screen was requested, the program will terminate. this causes
quit() to be called (set by atexit()), which in turn tried to free the
elements of f.c, which have not been created then.