#10 Marking modified task in tab header

[psimon68]

A lot of editors that show more than one file show
a star next to the filename in the related window frame
indicating that the content of this file has changed.

This would be neat to have in TT.
When having ten or more tasks open in tabs I'm always
unsure of which one was modified and which can be
closed right away wqithout loosing changes.