Restore chat sessions preventing ghost connections

[marzavec]

Related to this todo, restoring a chat session that has gone through a "brown out". This will also fix the long standing bug with ghost nicknames.

After calling the session command, the client may get back a list of previous channels and other meta. It should restore the ui elements, rebuilding the redux store if required.

This feature is semi-dependent on the mutli-channel feature being implemented.