Identical to the Base64 encoding defined by RFC
1521 and allows a character set to be specified.
Similar to the Quoted-Printable content-transfer-encoding defined in RFC 1521 and designed to allow text containing mostly ASCII
characters to be decipherable on an ASCII terminal without decoding.
Codec for the Quoted-Printable section of RFC 1521 .
Implements the 'www-form-urlencoded' encoding scheme,
also misleadingly known as URL encoding.