refactor QT code
QT/UI code should be refactored into its own module.
(from redmine: created on 2012-08-23, closed on 2012-09-03, precedes #331 (closed))
QT/UI code should be refactored into its own module.
(from redmine: created on 2012-08-23, closed on 2012-09-03, precedes #331 (closed))