Elkm1

- Add zt decode and helper
- Add dm helper
- Fix speak word. Was using wrong Elk message code.

- Add 30 second timeout to create connection
- lint cleanups

- Set user name to default name if not configured
- Enhance IC decode to handle prox
- IC handler now saves user code
- Heartbeat bug; connect was called on heartbeat timeout AND then again on
disconnect callback
- Made log messages on connect/disconnect/error clearer and more consistent
- Change max time on connection retry to 60 seconds (was 120 seconds)
- Tidied up a couple of comments

- Add heartbeat

- Fix triggered_alarm attr to zone
- Add support for system trouble status (attached to panel)

- Add triggered_alarm attr to zone