Unnecessary "MuseScore: " prepended to most window titles and wrong title of Split Staff dialog
Currently has same string as Staff Properties.
This is very easy to take care of, but it brings up a related question: the "MuseScore: " at the beginning of most dialog's titles. This is highly unusual, at least in the Mac environment; is it expected on Windows or Linux? If not, I propose removing it from the various UI files.