[Bug 59531] Add a 'Quit Orca' button

[Henrik Nilsen Omma]

Public bug reported:

Orca is primarily designed with blind users in mind who tend to use
keyboard shortcuts for computer navigation. The only implemented way of
stopping Orca normally (other than 'killall orca') was with the Insert+q
keybinding. This is fine for blind users who prefer that, but when we
integrate Orca in the main Ubuntu desktop we also need an easily
discoverable way for users to close it. This patch creates a 'Quit Orca'
button which does that.

The next patch replaces the OK and Cancel buttons with a Close and Apply
button. This is more useful because Orca does not use gconf and hence
does not have instant apply. Magnification users have requested this
change because when they tweak the magnifier settings it is much more
useable this way.

(patches by Chris Jones)

** Affects: gnome-orca (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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Add a 'Quit Orca' button
https://launchpad.net/bugs/59531