use a better way to order the DS18B20s and transmit their IDs using persistent memory?

[jerabaul29]

• have a persistent array in RAM with the IDs ever detected before (ID_detected_array)
• have in the packet the index in the ID_detected_array, not the 6-bit ID; this can still be 6-bits, or it can be fewer, depending on the number of sensors
• transmit the 8-bit or 10-bit or 16-bit list of IDs at the end of the message