* FastRNG: fix warnings, optimize bool01()
* UTF8: limit warnings on Android due to jni.hpp include
* Remove unused includes
* UTF8: add missing fmt/format.h include
* Tests: remove invalid test
* Fix shaders not copying to final build on macOS for non Xcode builds
* Fix macOS build after adding minimum CMake 3.20 requirement
* Refactor "Fix macOS build after adding minimum CMake 3.20 requirement"
* 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`