Ppmd-cffi

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* Change github repository name from ppmd to ppmd-cffi

Added
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* Add CodeQL static code analysis
* Add dependabot dependency checker

Changed
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* Set configurations on pyproject.toml(14)
* README: change status to maintance

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Changed
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* Improve performance by moving main loop part into C code.

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Added
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* Win32 build

Changed
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* Overwhole extension C code headers(12)
* Update release github actions script to use cibuildwheel action

Fixed
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* check mem_size argument with sys.maxsize to avoid overflow (12)

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Added
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* Test case to check range of max_order and mem_size

Changed
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* Allocate internal buffer memory with Python's memory manager.

Removed
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* Stop publish of AArch64 anylinux package

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* Change to beta status
* Measure test coverage
* Add type hint stubs

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* CLI: handle filename and timestamp properly.