Add new pySim.ota library, implement SIM OTA crypto

This introduces a hierarchy of classes implementing

* ETS TS 102 225 (general command structure)
* 3GPP TS 31.115 (dialects for SMS-PP)

In this initial patch only the SMS "dialect" is supported,
but it is foreseen that USSD/SMSCB/HTTPS dialects can be
added at a later point.

Change-Id: I193ff4712c8503279c017b4b1324f0c3d38b9f84

contrib/jenkins.sh

@@ -26,6 +26,7 @@ pip install bidict
 pip install gsm0338
 pip install termcolor
 pip install colorlog
+pip install pycryptodome
 
 # Execute automatically discovered unit tests first
 python -m unittest discover -v -s tests/