Add asterisk to filename to show it is not saved

Many programmes will add an asterisk to a file name to show that the file is unsaved. Adding this would provide the user with a visual cue that they need to save their file.

Sample image 1: No asterisk displayed. Sample image 2: Dot next to save icon to show the file is unsaved in LibreOffice. Sample image 3: Asterisk next to file name in TrenchBroom to show the file is unsaved.