Libzim

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* [Writer] Use a `.tmp` suffix and rename to `.zim` at the end of the write
proces.
* Add unit tests
* Do not include uncessary `windows.h` headers in public zim's headers.

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* [CI] Fix codecov configuration
* [Writer] Fix threads synchronization at end of writing process.

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* Fix bug around the find function

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* Compile now on OpenBSD
* [Test] Use the main function provided by gtest.
* [CI] Move the CI compilation to github actions.
* Add stopwords for 54 new languages.
* [Writer] Improve the way we are writing cluster at zim creation time.
- Clusters are directly written in the zim file instead of using temporary
files.
- mimetypes are limited to 944 bytes.
* Add a new type of iterator to iterate over articles in a performant way
reducing decompression of clusters. This is now the new default iterator.
* Add support for zim files compressed with zstd compression algorithm.
This is not possible to use zstd to create zim file for now.

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* Fix search suggestion parsing.

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* Fix crash when trying to open an empty file.
* Ensure that pytest tests are run on the CI.