This commit removes the moodle-behat-extension from the list of
third-party libraries.
In order to do this properly, all pending coding-style issues are fixed.
In addition the following niceties have also been included:
* convert long form array() syntax to short form
* alphabetically sort class imports (use)
* remove unused class imports
* correct documentation
* Normalise whitespace in concat operators
* Remove unnecessary file docblocks