Get uploads working with new media repo

synapse/api/urls.py

synapse/app/homeserver.py

synapse/config/_base.py

synapse/config/repository.py

synapse/http/server.py

synapse/media/__init__.py

synapse/media/v0/__init__.py

synapse/media/v0/content_repository.py

synapse/media/v1/__init__.py

synapse/media/v1/media_repository.py

synapse/media/v1/upload_resource.py

synapse/server.py

synapse/storage/__init__.py

synapse/storage/media_repository.py