dXSS: Filter dangerous values from the GET parameters

This class can be used to filter dangerous values from the GET parameters.

It can traverse the list of GET request values and check if they contain values considered to be dangerous.

Dangerous values are those with text from a list of dangerous strings, have non-alphanumeric characters or have a length larger than a given limit.

The class sends a response header to redirect the user browser to another given URL if a dangerous GET values is found.