Libzim

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* Improve README.
* Remove gtest as embeded subproject.
* Better lzma compression.
* Better performance of the leveinstein algorithm (better suggestions
performance)

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* Update README.
* [Writer] Add debug information (print progress of the clusters writing).
* [Writer] Correctly print the url to the user.
* [CI] Add code coverage.

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* Fix thread slipping for win32 crosscompilation.
* Fix a potential invalid access when reading dirent.
* Fix memory leak in the decompression algorithm.
* [Writer] Fix a memory leak (cluster cleanning)
* [Writer] Write article data in a temporary cluster file instead of a
temporary file per article.
* [Writer] Better algorithm to store the dirent while creating the zim
file. Better memory usage.
* [Writer] [API Change] Url/Ns are now handle using the same struct Url.
* [Writer] [API Change] No more aid and redirectAid. A redirectArticle
have to implement redirectUrl.
* [Writer] Use a memory pool to avoid multiple small memory allocations.
* [Writer] [API Change] Rename `ZimCreator` to `Creator`.
* [API Change] File's `search` and `suggestions` now return a unique_ptr
instead of a raw pointer.

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* Build libzim without rpath.

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* Support zim file created with cluster not written sequentially.
* Remove a meson warning.

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* Store the xapian database in the right url.
* Do not fail when reading very small zim file (<256b).
* Do not print message on normal behavior.
* [BUILDSYSTEM] Be able to build a dynamic lib (libzim.so) but using static
dependencies.
* [CI] Use last version of meson.
* [CI] Use the new deps archive xz