Split current scene into two scenes

[BeyerMart]

The application contains two workflows: parsing and generating output.

Currently, both are visible from the start, but generating output can only happen after parsing.

• The first scene would be all about what to parse and how to fill the invoice number.
• In the second scene, the table should be visible and the user is able to generate output.

In every scene, the workflow specific settings should be accessible. The user can navigate back and forth between the two scenes.