added handling custom icon and separate taskbar entry for Windows 7+
added handling custom icon and separate taskbar entry for Windows 7+

Ttl/scikit-rf,Ttl/scikit-rf,jhillairet/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf,Ttl/scikit-rf,scikit-rf/scikit-rf,jhillairet/scikit-rf,jhillairet/scikit-rf,scikit-rf/scikit-rf