unicode inputting

4.17: adde/unicode inputting:
. the editor should make it easy to type unicode:
menu#0 brings up the submenus
which arrange the unicodes in pages .
. each menu shows the key matrix map:
ie, what a key on the keyboard is launching,
either another menu,
or a unicode character in this situation;
that is, after it brings up the main menu,
the next key takes you to another key map,
and eventually the submenus get to a leaf menu,
where the key matrix map shows which
unicode character is currently assigned to each key .
. the unicode menu system should also include
a recent-keys menu and a favorites menu .