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