3.0.0-beta1

style: Apply php-cs-fixer
fix: Modernize test suite, drop horde/test
test(string): modernize PSR-4 tests and improve coverage
fix(string): prevent out-of-bounds access in validUtf8()
fix(string): validate charset before mb_substr in PSR-4 version
Fix deprecated $php_errormsg in PHP 7.2
Merge pull request #18 from powercycle/remove_deprecations_in_tests
Fixed deprecation warnings in test files for php 8.3