XML External Entity (XXE) Processing

https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

change simplexml_load_file to
simplexml_load_string(file_get_contents()) because load_file doesn't
work when
http://php.net/manual/en/function.libxml-disable-entity-loader.php is
true
Merge pull request #405 from ymaerschalck/develop

XML External Entity (XXE) Processing