If the word counter of a role drops to zero, the user is asked whether
he wants to delete or keep the role. If the user chooses to delete it,
it is deleted and the ui is updated.
Refreshing the pseudo roles saves the enabled state of the setPseuso
checkbox
Created wrapper classes to save a tree structure of the play
The act name panel is now a child of the act panel
The scene name panel is now a child of the cene panel
Acts together with their ui panel are now stored in a wrapper.
Empty acts are now deleted automatically
Empty scenes are now deleted automatically.
Refactored common delete action into its own method