Fixed separators, treeviews, cleanups.
Fixed separators, treeviews, cleanups.

 - finally got rid of the active column highlight
 - treeviews now match gtk3
 - separators now consistent, longer scale to prevent thick lines
 - libreoffice menu arrows now scale properly
 - cleaned up the rest of matches

DoctorJellyface/gnome-themes-standard,DoctorJellyface/gnome-themes-standard