Unified intregration updated

[albaintor]

Several modifications here :

• Handle of new event types from the HA driver : unfoldedcircle/event/configure/(un)subscribe in order to send the new entities configured from HA side to the HA driver and update the remote
• Handle of unfoldedcircle/event/entities/(un)subscribe in order to send the specific events that concern only the submitted entities
• Rework of the setup flow to integrate the selection of entities, as well as the config flow after setup to modify the list of subscribed entities.
• Rework of the websocket interface initially loaded on the coordinator but problematic : no coordinator exist if no remote is configured, multiple coordinators so duplicate subscriptions if multiple remotes configured. Websocket is now instantiated as singleton from multiple places : from coordinator, from config flow and especially during zeroconf config flow which is useful to get an instance BEFORE the user starts the config flow and get events then.
• Some updates to support webconfigurator, and update of the regex for Remote 3 (TBC)
• Other modifications I don't remember :-)