gtktemplate: Allow connecting signals of the template class itself
gtktemplate: Allow connecting signals of the template class itself

flobrosch/vala-fixes,rvu95/vala,flobrosch/vala-fixes,GNOME/vala,GNOME/vala,frida/vala,spidermonkdust/vala,GNOME/vala,frida/vala,frida/vala,xdave/pvala,Distrotech/vala,GNOME/vala,frida/vala,rvu95/vala,spidermonkdust/vala,Distrotech/vala,spidermonkdust/vala,Distrotech/vala,rvu95/vala,flobrosch/vala-fixes,frida/vala