The request class
- now makes use of the new type cast helper (dependency injection)
- has no static methods anymore.
- now has a constructor argument to leave super globals turned on
Brought back the set_var function in functions.php. It is now a wrapper
around the type cast helper. It creates an instance on the fly.
The request_var wrapper function now has an optional last argument to
inject the request class instance, rather than abusing the $var_name.
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