* apdu/ts_102_221: Fix SELECT of 3f00
* apdu/ts_102_221: Implement SELECT case "df_ef_or_mf_by_file_id"
* filesystem.py: Make CardDF.get_selectables() respect the flags
* 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