This helps Git and Vim be less confused about diffs.
It somehow sometimes happens that a newline is added to
the end of language-data.json, but sometimes it is not added,
and then Git diff shows it as removed or added. This change
ensures that it's always added.
This was happening because the location of the data directory has
been updated, but this script - `ulsdata2json.php` was not properly
updated.
Bug: T249210
Fixes: #88
Additional changes in this PR include,
* Added composer.json
* Refactored the folder structure.
* Added editorconfig.
* Added PHPCS and formatted existing code.
* Changes to use a single license - GPL-2.0-or-later
* ESLint related fixes
Bug: T218639