Added static media handling (Fixes #2223) Now DEBUG compatible
Added static media handling (Fixes #2223)
Now DEBUG compatible

Commit fe64941aabd0228fc8090ca21f2f99df5204ee20
replaced former use of tornado as webserver with django channels.
During this, the additional routing path for /media/ was forgotten.
This is now fixed.

Due to the routing scheme, the static URLS were added beforehand.
Adding it afterwards does not work.

jwinzer/OpenSlides,CatoTH/OpenSlides,FinnStutzenstein/OpenSlides,CatoTH/OpenSlides,boehlke/OpenSlides,FinnStutzenstein/OpenSlides,emanuelschuetze/OpenSlides,normanjaeckel/OpenSlides,jwinzer/OpenSlides,jwinzer/OpenSlides,emanuelschuetze/OpenSlides,FinnStutzenstein/OpenSlides,OpenSlides/OpenSlides,normanjaeckel/OpenSlides,CatoTH/OpenSlides,boehlke/OpenSlides,normanjaeckel/OpenSlides,FinnStutzenstein/OpenSlides,boehlke/OpenSlides,jwinzer/OpenSlides,tsiegleauq/OpenSlides,ostcar/OpenSlides,jwinzer/OpenSlides,emanuelschuetze/OpenSlides,boehlke/OpenSlides,ostcar/OpenSlides,ostcar/OpenSlides,normanjaeckel/OpenSlides,emanuelschuetze/OpenSlides,tsiegleauq/OpenSlides,tsiegleauq/OpenSlides,CatoTH/OpenSlides,OpenSlides/OpenSlides