add hex rgb support

[abzman]

needed for tasmota rgb lights

[mkfink]

Wrote a workaround that works and only generates error messages in home assistant when scheme/effect is changed. See rgb_value_template below, which is set up for RGB. Swap the indices around for GRB or whatever support.

Explanation in case some poor soul runs across this:

• the {% if "THING" in value_json %} parts work to suppress errors in home assistant since tasmota publishes color, dimmer, etc to stat/.../RESULT {json} and the contents of the json can vary. These parts may not even be necessary.
• (value_json.Color[0:2] | int(int, 16)) | string takes the first two characters of the color value in hex formatted like "RRGGBBWW", treats it like an int, passes it through python's int() function with a second parameter being the base of the input resulting in the decimal value of "RR", converts it back to a string, and finally concatenates it together with commas and the G and B values into the format home assistant expects the RGB value to be published in, a string like "100,150,255" (note there are no parentheses, cannot be a tuple like (R,G,B).)

  name: Elab Arch South
  effect_list:
    - 2
    - 3
  state_topic: "stat/i3/inside/elab/accent/arch-south/RESULT"
  command_topic: "cmnd/i3/inside/elab/accent/arch-south/POWER"
  brightness_state_topic: "stat/i3/inside/elab/accent/arch-south/RESULT"
  brightness_command_topic: "cmnd/i3/inside/elab/accent/arch-south/Dimmer"
  brightness_scale: 100
  rgb_command_template: "{{ '%02x%02x%02x00' | format(red, green, blue)}}"
  rgb_state_topic: "stat/i3/inside/elab/accent/arch-south/RESULT"
  rgb_command_topic: "cmnd/i3/inside/elab/accent/arch-south/Color"
  effect_command_topic: "cmnd/i3/inside/elab/accent/arch-south/Scheme"
  effect_state_topic: "stat/i3/inside/elab/accent/arch-south/RESULT"
  state_value_template: >
    {% if "POWER" in value_json %}
      {{ value_json.POWER }}
    {% endif %}
  brightness_value_template: >
    {% if "Dimmer" in value_json %}
      {{ value_json.Dimmer }}
    {% endif %}
  effect_value_template: >
    {% if "Scheme" in value_json %}
      {{ value_json.Scheme }}
    {% endif %}
  rgb_value_template: >
    {% if "Color" in value_json %}
      {{ (value_json.Color[0:2] | int(int, 16)) | string + ',' + (value_json.Color[2:4] | int(int, 16)) | string + ',' + (value_json.Color[4:6] | int(int, 16)) | string }}
    {% endif %}
  payload_on: "ON"
  payload_off: "OFF"
  on_command_type: "brightness"