Libzim

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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.

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* [Writer] Index the articles in differents threads. This is a huge speed
improvement as the main thread in not blocked by indexing.
* Index the title only if `shouldIndex` return true.

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* Improve indexation of the title.
* Better pertinence of suggestions (only for new zim files)
* Improvement of the speed of Leveinstein distance for suggestions (for old
zims)