feat: fire an event when operation mode changes

* so that the entities shown are in sync

feat: ignore pylint duplicate-code

feat: select for operation mode

feat: home/away switch

feat: don't symlink translations/en.json

docs: update README.md

docs: add README.md

feat: request values in single query instead of multiple

feat: update eh800 after creation

fix: remove unused _available

feat: most of the functionality

format

initial