Improvements in checking font compatibility#302

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buggins merged 5 commits intobuggins:masterfrom

virxkane:locale-db

Jul 13, 2021

Commits on Jul 8, 2021

Update converted FontConfig database of language orthographics from
virxkane
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Commits on Jul 9, 2021

* Added tables for ISO-639, ISO-3166, ISO-15924 from
virxkane
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Commits on Jul 10, 2021

A more correct comparison of the language tag when determining the compatibility of the font with the document language.
virxkane
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Restored functionality of engine's unit testing.
virxkane
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Commits on Jul 12, 2021

Updated project files: removed obsoleted paths.
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