* pySim.app: Attempt to retrieve the EID of a SGP.22 / SGP.32 eUICC
* pySim-shell: Migrate PySimApp.iccid to RuntimeState.identity['ICCID']
* runtime: Introduce an 'identity' dict for things like ATR, ICCID, EID
* ts_102_221: Proper parsing of FCP using pySim.tlv instead of pytlv
* tlv: Don't raise exception if somebody passes empty data to TLV decoder
* filesystem: Don't pass empty string to parse_select_response()
* Extend unit test coverage for construct, add [some] tests for TLV
* construct: Add Construct for variable-length int 'GreedyInteger'
* Fix various mistakes around the CardADF <-> CardApplication dualism
* filesystem: fix various issues found by mypy
* filesystem: Avoid GPL header showing up in sphinx autodoc
* Use sphinx for generating documentation
* Add more documentation to the classes/methods