Directory string in Windows

Hi.

Currently, when some directory is shown on Windows environment, it's written UNIX-line, with slashes instead of back-slashes.

e.g.,
Edit->Preferences...->Paths
Working Directory: U:/My Documents/score

The expected string is:
Working Directory: U:\My Documents\score

It should be quite simple to fix this, by using "QDir.toNativeSperators()".
I've tried to fix it myself, but my compilation failed [before loading this file :) ], so I couldn't check my fix...

The fix should be in:
mscore/mscore/preferences.cpp, lines #724, #1013
instead of
724 workingDirectory->setText(p->workingDirectory);
...
1013 if (!s.isNull())
1014 workingDirectory->setText(s);
1015 }

it should be
724 QDir dir;
725 workingDirectory->setText(dir.toNativeSperators(p->workingDirectory));
...
1014 if (!s.isNull())
1015 QDir dir;
1016 workingDirectory->setText(dir.toNativeSperators(s));
1017 }

Of course, this is just one place that should be modified; once the fix is approved, we should change all relevant code.

Thanks,
Zvika