Alexa Hue with multiple devices

[s-hadinger]

Description:

BREAKING CHANGE if you have Alexa/Hue emulation with more than 1 device, or with Zigbee. In such case, you need to remove the devices in the Alexa app and discover them again. No change if you have only 1 Alexa device per Tasmota.

There is now a problem with Alexa / Hue emulation when multiple devices are on the same Tasmota. Before, mutiple devices would be distinguished by:

"uniqueid": "78:e3:6d:09:1d:a4:00:11-01"
"uniqueid": "78:e3:6d:09:1d:a4:00:11-02"
"uniqueid": "78:e3:6d:09:1d:a4:00:11-03"

It seems now that the Alexa app gets confused if they differ only by the characters after -. We are now changing the encoding as follows:

"uniqueid": "78:e3:6d:09:1d:a4:XX:YY-01"

where XX is the high 8 bits of id (unchanged) and YY is the low 8 bits xor 0x10 (so default 1 becomes 0x11)

If the endpoint is not zero, XOR the second byte (rare case)

Related issue (if applicable): fixes #22227

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.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.0.241023
• I accept the CLA.

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