Added channel configuration and names

[aschempp]

This Pull Request adds per-channel configuration, currently supporting a channel name and to exclude specific channels. In my case, I can name or exclude each channel of a RGBW2 in white-mode as well as channels of Shelly 2.5

The changes now also fetch the channel's name from a device if available and uses it instead of the device name.

This should fix the following issues: https://github.com/alexryd/homebridge-shelly/issues/277 https://github.com/alexryd/homebridge-shelly/issues/261 https://github.com/alexryd/homebridge-shelly/issues/236 https://github.com/alexryd/homebridge-shelly/issues/219 https://github.com/alexryd/homebridge-shelly/issues/116 https://github.com/alexryd/homebridge-shelly/issues/198

[praegustator]

@aschempp thanks for this pull request, it helps a lot with my Shellies 2.5.

[ChrMaass]

Thanks for this PR. Is the project no longer supported at all? The request has been open for so long now.