* Escaping HTML in several places.
* Adds PreUp config when one didn't exist.
* Adds environment variable support for PreUp and PreDown.
closes#549closes#655closes#656
See also
--------
- https://github.com/samrocketman/addons-homeassistant/issues/9
Co-authored-by: Robert Willert <rwillert@users.noreply.github.com>