Update of dependencies - Update PHPUnit, PHPCode_sniffer - Remove apigen

Update phpunit configuration 

Add MySQL version to the environment variables The default version of MySQL is 5.7.22. This change follows the change of MySQL for version 8 and the possible incompatibility with php and phpMyAdmin. see the links: - https://bugs.php.net/bug.php?id=76243 - https://stackoverflow.com/questions/49948350/phpmyadmin-on-mysql-8-0

Documentation improvement 

Update README 

Add a dynamic host name in the configuration - Improve Makefile commands - Update documentation

Update README 

Add Version Badge 

Update README 

Fix composer apigen error