* Use ParserOptions::newFromContext() to not depend on $wgUser and $wgLang

* Use ParserOptions::newFromContext() to not depend on $wgUser and $wgLang
* Use a WikiPage object instead of Article to get the text or the ParserOutput and create the object directly in getParsedSectionOrText()
* Use Title::getLatestRevID() instead of Article::getRevIdFetched() since the latter will always return the current revision ID when 0 is passed as second parameter to the constructor
* Pass the User object to Revision::getText()
* Removed double setting of $wgTitle