NewMenu()

          Creates a new menu structure

    Syntax:

         NewMenu( aOptions, aColors, lShadow ) -> aMenu

         aOptions : A one-dimensional array with the structure:

                       { cOption1, cOption2, ..., cOptionN }

                    Each option may include the symbol "^" to indicate
                    that the character it precedes will be the one you could
                    use with the Alt key to select the option.

         aColors  : An array of 9 elements specifying the colors for:

                     - Non-selected options
                     - Special character of non-selected options
                     - Selected option
                     - Special character of selected option
                     - Items of the submenus
                     - Selected item of the submenus
                     - Non-selectable items of the submenus
                     - Special character of non-selected submenu items
                     - Special character of selected submenu items

         lShadow  : A logic value to indicate shadowing. Default .F.

    Description:

         Creates an array defining the structure of a menu and the
         colors in which to display menu options and submenu items
         for each of the conditions listed above for aColors.

    Return:

         An array defining the structure and colors of the newly created menu.

    Example:

         aMenu := NewMenu( { "^System", "^Tools", "^Other" }, ;
                           { "N/W", "R/W", "W/B",  "W+/B", ;
                             "N/W", "W/B", "N+/W", "R/W", "GR+/B" }, ;
                           .T. )