Added support for Config flow and async

This release adds support for config flow and adds support for asynchronous operations for the API.

BREAKING CHANGE:

The domain changed from securitas_direct to securitas because of the config flow integration so if you are not installing the integration through HASC make sure that the folder in the custom_components is named securitas.

There is a new property in the configuration, check_alarm_panel that if set to false, will decrease the number of requests made to securitas but if you arm or disarm you alarm outside Home Assistant, the will inconsistency between the state of the alarm and what HA shows.