Added new dialog to let the user set the current tags. This dialog is very simplistic at the moment, and just contains a textbox and a listbox. The textbox takes a list of comma separated strings, which then gets added to the current tag set via the ITagSetProvider.AddFromDelimitedString. The listbox shows a list of previously used tag sets. Currently you can't select from the listbox, but each entry will be clickable.
Renamed the MainWindow window to OptionsWindow, and added a placeholder tab control.