Kodo

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* Patch: Expose fulcrum stack.

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* Minor: Added fulcrum stack.
* Minor: Added visualization of the encoding state.
* Major: Update kodo to version 30.
* Major: renamed ``copy_symbols`` to ``copy_from_symbols``.
* Major: Update kodo to version 29.
* Major: Added dependency for meta.
* Major: Update kodo to version 28.
* Minor: Added ``in_systematic_phase`` member function to systematic encoders.
* Minor: Added a simple benchmark example in ``examples\benchmark.py`` to
measure the encoding and decoding throughput with the Python API.
* Major: Removed the codec types where the tracing functionality was disabled.
Tracing is now available in all codecs, but it is not activated by default.
This change can significantly lower the RAM usage during the compilation.
* Minor: Restructured the library so that different codec types are
instantiated in separate cpp files. The optimizer might use
gigabytes of RAM when instantiating a lot of codec stack variants in a
single cpp file. This problem is mitigated with this separation.
* Major: Upgrade to kodo 26.

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* Minor: Added perpetual codes + example.
* Major: Update kodo to version 25.
* Major: Update fifi to version 19.
* Major: Rename ``encode``, ``decode``, and ``recode`` to ``write_payload``,
``read_payload``, and ``write_payload``, respectively.

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* Patch: Updated README to reflect new licensing requirements.
* Patch: Update waf.

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* Patch: Fix version function.

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* Minor: Add version attribute to kodo python module.
* Major: Update kodo to version 22.
* Major: Update sak to version 14.
* Major: Update fifi to version 17.
* Minor: Added ``no_code`` algorithm.
* Major: Removed decoder methods: ``is_symbol_uncoded``, ``decode_symbol`` and
``decode_symbol_at_index``.