Fix for 2021.5

• Add iot_class to manifest.com
• Apply lint fixes

Support TCW181B-CM

• Add support for TW181B-CM

Better handling of unsupported devices

v0.1.2-beta.1

Only accept supported models

First release that is reasonably complete

First release for test and feed-back

First beta release

Integrates Teracom TCW122B-CM with Homeassistant

Creates sensors for all inputs and switches for the two relays.

This is the first beta release. More functionality will be added over time.