Added issue edit dialog and some content of the view
Applying enums to wpf controls
Added update and delete methods for issue
Implemented updating of issues
Issue can now be added to projects
Changed the displayed issue columns
Made the db errors more chatty
Rearranged issue edit controls
Simplyfied the add/edit handling of entities
Added length constraints for specific properties
Aborting a dialog now revokes changes made to the edited entity
Extracted the create & update logic out of the editviewmodels
Merge branch 'Issues'