Win32: use the widget to display the RSSI and Link Speed values as this is far better understandable than the raw numerical values (especially if you don't know the values well).
the GTK VU meter widget is based on LGPL'ed code from http://www.mumblelina.com/index.php?gtkvumeter=1
... and I've heavily changed and extended it to fit the problem here.
We might use the VU meter widget later at other places as well ...
svn path=/trunk/; revision=19298
