Simulace okna v command-line
https://rhardih.io/2010/04/using-ncurses-in-c-for-text-user-interfaces-featuring-xcode/
keypad
Zdroj: http://pubs.opengroup.org/onlinepubs/7908799/xcurses/curses.h.html
http://pubs.opengroup.org/onlinepubs/7908799/xcurses/mvprintw.html
http://pubs.opengroup.org/onlinepubs/7908799/xcurses/newwin.html
https://www.youtube.com/watch?v=3YiPdibiQHA
https://forums.whirlpool.net.au/archive/1042961
kbhit()