dova: Support calling hash on generic type parameters
dova: Support calling hash on generic type parameters

spidermonkdust/vala,tjol/vala-tjol,kamanashisroy/aroop,rvu95/vala,jessevdk/vala,flobrosch/vala-fixes,Distrotech/vala,frida/vala,kamanashisroy/aroop,GNOME/vala,playya/vala,severinh/vala,playya/vala,jessevdk/vala,severinh/vala,jessevdk/vala,severinh/vala,GNOME/vala,tjol/vala-tjol,playya/vala,Distrotech/vala,frida/vala,rvu95/vala,kamanashisroy/aroop,frida/vala,spidermonkdust/vala,frida/vala,flobrosch/vala-fixes,frida/vala,spidermonkdust/vala,tjol/vala-tjol,GNOME/vala,GNOME/vala,Distrotech/vala,xdave/pvala,flobrosch/vala-fixes,rvu95/vala