* Add unit-tests app for running automatic unit tests
* Move unit tests from cpp-tests to unit-tests
* TEMP
* Add FileUtils::fullPathForDirectory() tests
* Use test assets from `axmol-sample-assets` repo
* Add more FileUtils::isFileExist(), FileUtils::isDirectoryExist() tests
* Add `unit-tests` builds to GitHub's workflows
* Fix `.github/worflows/build.yml`
smilediver