Improve cpicker in two ways

[aseanwatson]

1. Add support for new attributes:
   • mode is a read/write attribute which has a value of hue, saturation, or value and exposes lv_cpicker_get_color_mode/lv_cpicker_set_color_mode.
   • mode_fixed is a read/write Boolean attribute and exposes lv_cpicker_get_color_mode_fixed/lv_cpicker_set_color_mode_fixed
2. MQTT status responses include h, s, and v attributes from cpicker.

{
  "id": 4,
  "parentid": 2,
  "obj": "cpicker",
  "x": 25,
  "y": 5,
  "w": 180,
  "h": 180,
  "mode_fixed": true
}

[aseanwatson]

Hi, I couldn't find requirements for contributing, so sorry if I'm not following the right protocol.

If this is something worth pursuing, I can make a PR against the https://github.com/HASwitchPlate/openHASP-docs repository.

Needless to say, I tested it by opening a telnet session into a device with the firmware and turned on/off mode_fixed and confirmed the control acted appropriately. I also confirmed that reading it gave the value I just set.

Similarly, I was able to see the mode as changed by long-pressing the control (when mode_fixed was false) and set the mode in a telnet session.

Finally, I confirmed that the debug logs showed the new "h": XXX, "s": XXX, "v": XXX attributes on change and was able to see the values in Home Assistant.

[fvanroie]

Looks good!

[fvanroie]

Thanks for this contribution, it's right in line with the other properties. Well done.
I'll merge these new properties. Please submit a commit to the docs 0.7.0 repo too.

One minor thing is updating the CHANGLELOG.md but I'll add these changes next time around.