Rename dirauth/mode.h to dirauth/authmode.h

src/app/config/config.c

src/app/main/main.c

src/core/include.am

src/core/mainloop/mainloop.c

src/feature/dirauth/authmode.h

src/feature/dirauth/dirvote.c

src/feature/dirauth/shared_random.c

src/feature/dircache/dircache.c

src/feature/dirclient/dirclient.c

src/feature/nodelist/networkstatus.c

src/feature/nodelist/nodelist.c

src/feature/nodelist/routerlist.c

src/feature/relay/router.c