Massive code rewrite, autodescovery

• Massive code rewrite
• Auto discovery MegaD devices
• Auto generate MQTT descriptions for autodiscovery in Home-Assitant work

Next step

• added supported MegaD-2561
• some improvements and fixes

First release

First public release.
Code rewrited to use asyncio for improve speed. So minimal version of python is 3.5.
Supported ports of next types:

• input (switch etc),
• outputs (relay, dimmed outputs).