Improved CoolMasterNet integration for Home Assistant

This is an alternative Home Assistant integration for CoolMasterNet devices.

Compared to the built-in integration, this one adds a few extra features:

• other transports - in addition to telnet, serial is now supported and the code is structured in such a way that other transports can be added down the line (REST and maybe even CoolAutomation's official cloud)

• reporting of AC heating/cooling demand if supported (otherwise faked locally based on temperature differences)

• AC unit capability (heat, cool, dry, etc) as well as display name is now configured at the CoolMasterNet gateway level using props commands - this means that the configuration persists with the gateway and is independent of HA. I also believe that's how CoolAutomation's cloud-based app does it, so it would make switching to Home Assistant easier for users of the official app (and in fact they would be able to coexist)

• reporting of AC unit error status

• reporting of filter status and a "button" integration to reset it

• support for the "feed" command to provide ambient temperature in the form of a service

• support for the "fan swing" functionality, if the device supports it

How to use

• telnet into your CoolMasterNet and set unit properties using the props commands (see documentation for details) - you want the name, modes and fan speeds set accordingly
• install the custom component using your favorite method
• add the integration using the UI - it should auto-detect all the units configured in the CoolMasterNet gateway

Credits / thanks

• OnFreund's pycoolmasternet-async
• koreth's pycoolmasternet