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[WIP] Make IMSI Pseudonymization an optional extension of 3GPP TS

NOTE: this file is deprecated, it will be replaced by imsi-pseudo-spec.adoc.

Relevant specs:

3GPP TS 23.008: Organization of subscriber data
- Add pseudo IMSI and pseudo_imsi_i optionally to be saved in the HLR
"Process Update_Location_HLR" of TS 09.02
- Cancel location in old VLR/SGSN if IMSI pseudonymization is enabled, and a previous pseudonymous IMSI exists for the subscriber

Optional additions we need to make, and where to make them:

Initial provisioning of the SIM: can optionally have a pseudo IMSI
During location update, the HLR uses the pseudo IMSI for all communication with the VLR / MSC
- Is there anything to update? We just replace the IMSI, so the SIM and the VLR / MSC don't act any different
After successful location update:
- See 2. in README.md

TODO:

extend the list above with the exact sections of the spec, where the new information should be placed
Is there a spec for SIM applets, or do we put the SIM applet behaviour in the regular spec for SIM cards, or mention its behavior in the location update related change?
describe everything in detail, fill in the full contents for the SMS etc.