Fixed #597: Request data is not cleaned for variables affected by register_argc_argv or register_long_arrays
Fixed #598: Copies of $_SERVER values in $_ENV are not cleaned
Fixed #603: $HTTP_RAW_POST_DATA is not removed on request startup
Fixed #605: WebRouting does not clean up in $_REQUEST
merge ddde8d16edd59ad791770160b6291826d6288e3c