Support system selection in optionflow

• Allow wanted systems to be selected in option flow
• Correct update of entities

Modernization of component

What's Changed

• Added system health by @Tommatheussen in #109
• Modernize component by @elupus in #111

Full Changelog: 1.1.1...1.2.0

Correct issue with thermostat

1.1.1

Bug fix for termostats

Always add all discovered systems

• Instead of requiring configuration of systems/units in yaml. Always add all systems and units found for a user.

Fixes for fans and sensors

Support fans and state class measurements