Add a Live Connect extension to be able to react to the very tiny bit of exposed JavaScript API for host containers.
The current implementation is very very very simple and minimal, and misses a bit of stuff (eg the queue'ing for messages, errors, etc), but for now seems working.
Many thanks to Maksim for his precious help with the extension working :)

svn path=/trunk/KDE/kdegraphics/okular/; revision=792030