add NamedTuples for Levels, Labels and States.
refactor the levels properties
update the math in util.comp()
StripLevel/BusLevel getters updated according to changes in VbanPacketNBS0
remove {VbanCmd}._get_levels(), it's no longer necessary.
now packaged with poetry.
added to pypi.
major version bump due to dependency change.
interface reworked to match the remote-api interface.
readme updated with changes to installation
pre-commit hook temporarily removed
added a couple of lower tests.
add some string tests to higher tests.
added bus class
add higher commands show, hide, shutdown, restart, version and type