R1:c1c5fbce2139

Rebuild Conpherence

Summary:
Minor rebuild / redesign of Conpherence. Most of this is new UX and tossing out things like widgets, device fallbacks. I expect some of the UI to get more polished after next pass, but most everything here is in place.

- Removed "Widgets", now just a single Participants pane
- Added "Topic"
- New header
- Settings, Edit are action icons
- Removed a lot of JS
- Simplified CSS as much as I could

Test Plan:
Desktop, Tablet, Mobile. Adding and removing people. Setting new…