add guiicons to make-updates

Created by: Helianthella

the guiicons folder contains the images used by npc menus;

for example:

mes "Please choose an option.";
menu
    "next|Do something.", L_Next,
    "quit|Do nothing.", L_Quit;

in this example, next is graphics/guiicons/next.png and quit is graphics/guiicons/quit.png