* Rollback modbus to version 0.107.7
Update manifest to not use async.
Rollback entities to sync version.
Keep newer modifications apart from async.
Rollback __init__ to sync version but keep the new functionality.
add async sub directory
Adding the current (not working) version in a sub directory,
to allow easy sharing with a few alfa testers.
The async version are to be updated to use the serial/tcp already
available instead of the flaky pymodbus version. pymodbus is still
needed to encode/decode the messagess.
Update test cases to reflect sync implementation, but
keep the new functionality like e.g. conftest.py.
* do not publish async version
The async version will be made available in a forked repo, until
it is ready to replace the production code.