Improve sniff handling of modern PHP code

While WP still has a minimum requirement of PHP 5.2 and a lot of related projects code accordingly, there are also numerous projects out there which have set their plugin/theme minimum requirement at PHP 5.3 or higher.

Most sniffs currently don't take things like namespaces into account so the below code would trigger an error (even though the fwrite function in this case is namespaced).

While this may not be the best example (or good practice in the first place), I would like to suggest we review code to see if we can make it more forward compatible with modern PHP code.

namespace MyNamespace;

function fwrite() {
	// A compat layer or something.
}

class My_Class {
	function do_something() {
		fwrite( $param );
	}
}

No files or tests are named. Start by reviewing the repository's PHP_CodeSniffer sniffs against the namespaced fwrite() example and identify which reports are incorrect. Done should mean modern PHP code using namespaced functions is handled correctly without losing support for the project's PHP 5.2 compatibility requirements.