-toggles between characters and their unicode notation
-sets Alt-X as a global keyboard accelerator
-handles all of the unicode planes
-intelligently handles combining characters
-if text is selected, limits the input to that text
-implemented in Writer, Draw, Impress

Change-Id: Idcd8e7f0a4f1b81fa7f5f3200c76be19472ffa37
Reviewed-on: https://gerrit.libreoffice.org/17535Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>