Allow blacklisting applications

[Syndrizzle]

I don't know if it is currently possible to do so, since there is no issue that states this problem, but some of my applications like xfdesktop, ulauncher and the GTK based applications look weird when used with xborders, on the GTK applications there is a big gap between xborders and the GTK application window, I guess probably because of GTK frames. I do want xborder to work with GTK applications, so if it is possible to fix it instead of adding GTK apps to blacklist, it would be amazing, something similar happens with ULauncher and xfdesktop is just a component of the xfce session so idk why it has borders.

[deter0]

The GTK frames issue has been fixed to my knowledge. I will be adding a blacklist feature also

[deter0]

Blacklisting windows is now in the testing branch!