Add room ID prefix to routes

Tom Käslerrequested to merge
prefix into master

Use room ID from routes in settings.
Use constant from VoteController to set base endpoint.
Also move stats route to the stats controller, where it doesn't have an (in this case) unnecessary room ID prefix.

Closes #15 (closed)
Depends On arsnova-http-gateway!65 (merged)

Edited by Tom Käsler

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