- more preferences dialog work - making a preferences panel class for
handling of loading data from preferences and saving it again.
- preferences category tree generation from XML
- general tidy up.
- making Quit work properly so that we can shut down cleanly.
git-svn-id: svn://10.0.0.236/trunk@98357 18797224-902f-48f8-a5cc-f745e15eee43
