* docs: shell: link to cmd2 documentation
* docs: shell: By now we have encoders/decoders for most files
* docs: shell: Clarify various different card support
* 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