Request Validation: Validate POST and GET request values

This class can validate POST and GET request values.

It can take an array of POST or GET values and performs validations of many types for each field.

Currently it can validate required values, letters, letter, numbers, symbols, boolean states, currency amounts, dates and time, decimal values, email addresses, inputs that must have an equal value, text length, person names, regular expressions, URLs, mac addresses, IP addresses, hostnames, and lists of values.

The class returns an array with the list of invalid request values.