1 - Added two variables to call to dialog_menu() to save the position
2 in the menu when choosing a menu-option.
4 - Added dialog_fselect(), implements a fileselector dialog
5 - Added ui-interface objects: Stringobject, Listobject and Buttonobject.
6 The fileselector dialog was built using these objects.
7 - changed dialog_menu to use PGUP and PGDN
8 - Added dialog_mesgbox, which display text given in a char buffer.