Convert Hass.io add-on options to YAML

[balloob]

Breaking change

Proposed change

Converts hassio add-on options to YAML. Show error if it's invalid.

Fixes #4622

@bramkragten I made some changes to ha-yaml-editor that we need to validate in other places:

• Only call setValue on firstUpdated if it's defined. I ended up running into a race condition where value from parent was being overridden by firstUpdated. We should really rename this property to defaultValue, because it's only used on initial initialization. It's not used after that.
• Always fire value-changed if the value changed, even if it's invalid and so the value is actually not the same as the entered value. We read the isValid option from the editor on value changed to be able to show an error.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io