Added TETRA cryptographic primitives (TEA1-3, TAA1 minus TA61).
If a keyfile is loaded (using -k flag), matching signalling frames
will be decrypted. No support for traffic or identity encryption
yet. Based on https://github.com/MidnightBlueLabs/TETRA_crypto
Change-Id: I0c0227cf5b747bd5032602390175b898173f6ae6
wbokslag