* sim-rest-server: use UiccCardBase instead of UsimCard
* sim-rest-server: do not select ADF.USIM in connect_to_card
* cards: get rid of method read_iccid
* 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