Support In-Process Remote Server-side API

[vinomaster]

We have received requests to address the need for Server-side Session State Management.

The primary objective here is to extend our architecture to allow for a server-side participant in a session.

This task will also mean a migration away from our existing Extension API.

We have discussed an approach whereby we will overhaul our Admin and Session APIs to cover the following capabilities:

Class:Admin

• Creates Session
• Manages Session LifeCycle
• Published REST API

Class: Session

• Creates Moderator
• Creates Bots
• Coweb Protocol Handler

Class: Moderator

• Interfaces with OT Engine
• Manages Coweb Events for Session

Class: Collab

• State Request no longer needed as Server is handling

[vinomaster]

Depends on Issue #146