Move room preferences into own controller

Summary: Ref T12591. These preferences are per user and we need to reload the whole UI on a change anyways. Simplifies future expansion.

Test Plan: Option click into new window, set preferences. View in Conpherence, see saved settings, change sound. Hear new sound.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12591

Differential Revision: https://secure.phabricator.com/D17740