Remove unused reference to dialog
Use a normal main window for the app

The main window of the app is currently a dialog which is a bit annoying
as it means there's no minimise/maximise and you can't snap to the side
of the screen.

* Swapped the control from QDialog to QMainWindow
* Updated filenames to match
* Updated all references
* Regenerated makefile (automatically in qt creator)
* Updated project file .pro
* Made ignore more generic to catch all form file outputs