First steps towards remoting the FontBrowser plugin.

Splits up the UI and Probe part and makes it compile. The model
is properly shown in the client but no interaction is possible
so far.
Propagate UI interaction signals to server
Finish up the remoting of the font browser.

This will only work if the fonts are also available on the client
side though. To fix this, one would need to render pixmaps on
the server and send them to the client.
Merge pull request #48 from KDAB/remote-fontbrowser

Remote fontbrowser