#7 key navigation in popup

[Arnaud BERCEGEAY]

- KEY_UP should allow to select previous object
- ESC should close the popup
- validation of the entry with RETURN doesn't work for
LIST popup
- RETURN key on TREE popup doesnt unselect the object
(which is still selected when the popup is opened later)
- when opening a popup, the default entry (checked)
should be selected for easier navigation (for example
when the popup menu has been openend by a key shortcut
of a button)

[STanda Opichal]

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- General menu (not only popup specifically) keyboard navigation
- Provide complete intellisense (either WinXP-like: using
1st letters of the menu entries, or Thing-like: smart
completion or even better bash-like: type any substring to
select an entry)