pamoja-lorawan 0.1.17

LoRaWAN 1.0.x MAC framing for pamoja: build and parse data-frame PHYPayloads with the message integrity code and payload encryption the spec mandates, plus the over-the-air-activation join exchange, so a long-range node speaks LoRaWAN, no_std and allocation-free. The secured-packet half ahead of the radio driver.