Improve Session Manager Behaviour
Main Window title: Show name of current session first
Session Manager:
- New --> "New empty", should remove all actors and switch to new session.
- Save As --> similar to current "New", but copy current session and switch to new session.
- Clone --> if clone current session ask the user if he/she wants to save before.
- Change window title if current session is deleted
Edited by Bianca Tost