- Ideally we somehow color the correct/incorrect tags in the editor.
- Line numbering is needed for the editor window otherwise you cannot
  interpret attacks.
- Bottom bar should have obvious 'view' buttons for attacks that provide
  views, to guide the user.
- Preferences window.
  - Save in local file on close.
  - Scyther executable should be able to be set by means of preferences.
    (Using a file select dialog)
