Fix instance subscriptions (#655)

Remove some assumptions that prevent subscription listeners from working on an
instance.  This means allowing the host to forward the event from the instance
to the controller; correctly storing subscription listeners by address rather
than by connection; and a bunch of network and event stuff to correctly clean up
a listener.

Remove the assumption that all subscriptions events contains the updates
property.  This meant fixing inconsistent types; always checking if the property
existed; fixing lots of the tests that made incorrect assumptions.

Minior fixes:
- Fix double firing of listener callbacks on first connection.
- Fix synced being set to true too early on first connection.
- Fix edge case interaction between last response and last snapshot for values
  with updated set as 0.

Also change the the output made during the start of tests to indicate something
is happening when start up is slow and allow for silent testing to reduce the
amount of text output to the console.

packages/controller/src/BaseConnection.ts

@@ -35,7 +35,7 @@ export default class BaseConnection extends lib.Link {
 
 		this.handle(lib.SubscriptionRequest, this.handleSubscriptionRequest.bind(this));
 		this.connector.on("close", () => {
-			this._controller.subscriptions.unsubscribe(this);
+			this._controller.subscriptions.unsubscribeLink(this);
 		});
 	}