Replace "kUtil::array_merge_recursive" with native function

Replace "kUtil::array_merge_recursive" with native function

In PHP 5.3 a function http://php.net/manual/en/function.array-replace-recursive.php was added which, judjing from description, does exactly what our own "kUtil::array_merge_recursive" function does.

After running some tests I believe we can safely start using this new function.

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