Fix all issues reported in the current code

[javigomez]

See the current report at: http://joomla-projects.github.io/jcms-codestyle/

[photodude]

Should this be an item in the CMS repo? With a note that the "Temporary exclusions" need to be lifted from the Codestyle subset in the CMS.

I would also suggest tying this code style push for the CMS to the PHPCS-2 version of the Joomla Code standards since we would have the fixer methods available to automatically resolve may of the issues.

(I've been testing the PHPCS-2 version of the joomla code standard ruleset and some of the custom sniffs against the CMS, here is the most recent test https://travis-ci.org/photodude/joomla-cms/jobs/73006281 )