Added playbill view
Spelling corrected
Title added
The name of a production is now shown in the title while editing
Playbill components added
The name of the play, number of acts and casting of the actors is now
displayed
Moved printing the cast of a role into its own method
Non-Actor roles are now included in the playbill
Added production name to the view title
Added file select dialog
playbillArea is now a class field
The playbill is now written into the selected savefile