Add initial implementation of console

* Add Console module to raise console events
* Add console webpage to /
* Add ws route /console to send events (connect, disconnect, subscribe...)
Add Subscription.channels(pid)
Add Console.disconnected event

Rename to Poxa.Console (duh!) and add tests
Raise disconnected event on socket termination

Also rename state to socket_id
Raise Subscribed event to Console
Raise unsubscribed console event when apropriate
Raise api_message console event when events are triggered
Do nothing on ws termination without a socket_id
Refactor Console code to send_message
Raise Client Event Messages on client-events