Ppmd-cffi

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* Rename to Ppmd7Encoder/Ppmd7Decoder from PpmdEncoder/PpmdDecoder for ver.H.

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* Support PPMd ver.I (PPMd8) encoding.
* Add CLI command ppmd that compress and decompress file using PPMd ver.I
It is intend to be compatible with ppmd-mini project.
* Drop `*Buffered*` api

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* Publish aarch64 manylinux2014 binary package.

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* Support python 3.9

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* Fix decompression algorithm.
* Release win/mac binaries.

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* Release manylinux binary on PyPI.
* Fix CI/CD configuration for main branch.