* docs/smpp-ota-tool: Add documentation/tutorial
* contrib/smpp-ota-tool: define commandline arguments in global scope
* contrib/smpp-ota-tool: use '-' instead of '_' in command line args
* contrib/smpp-ota-tool: fix description string (copy+paste error)
* tests/pySim-smpp2sim_test: add testcases for AES128 and AES256
* tests/pySim-smpp2sim_test/card_sanitizer: update card backup with new test keyset
* 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