Upgrade PHPUnit

Updating travis php version to 7.2

Modifying .php_cs and adding missing return types

Adding PHP CS Fixer config file and cleaning up php

Adding ocde coverage to Scrutinizer build step. Adding .editorconfig …

…file for PSR2

Fixing ambiguous type declaration in Load/Yaml. Adding Scrutinzer badge

Adding Affinity4\Config\Loader\Json for loading json config files

Adding .travis.yml