Minor improvments

• Minor code improvments
• Moved CI/CD to Github actions
• Moved to SonarQube

Fixed issue on PHP 7.3

v1.3.2

Fix due to PHP7.3 "compact" method change

Fixed 'required' issue

Fixed issue when 'required' = false throws Exception.

ConfigurationException

Mrluke\Configuration\Exceptions\ConfigurationException added.

Schema extended

Added method createFromFile that creates instance of Schema from given file (php array or json).