Improve color light integration with HomeAssistant for so19 1

[emontnemery]

Description:

This PR improves the way color lights are discovered by Home Assistant with SetOption19 = 1:

Lights with color support (RGB, RGBW, RGBWW)

Home Assistant will be using HS color instead of RGB color. This is a better fit because Home Assistant requires the RGB color to be absolute, whereas Tasmota scales the RGB color with brightness.

4-channel lights (RGBW)

Home Assistant 2021.7 introduces color mode white.
This is a good fit for Tasmota 4 channel lights which don't support independent control of all 4 channels.

4-channel lights will be discovered as supporting hs and white, but not both at the same time.

5-channel lights (RGBW)

5-channel lights will be discovered as supporting hs and color_temp, but not both at the same time.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.1.0.7.1
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass