Added RAK12500 GPS support
Added socket scan capability to determine which socket the GPS is connected to
T-beam supreme: added conditional to displaying location data to only when gps is active
* BasChatMesh: new onContactRequest(), for PAYLOAD_TYPE_REQ handling.
* companion, repeater and room_server: now with basic 'plumbing' to handle REQ_TYPE_GET_TELEMETRY_DATA (0x03).
* dependency: added CayenneLPP to libdeps
* all target.* modules now with a stub 'sensors' object.