Add Base64 Encoders and Decoders

A DESCRIPTION OF THE REQUEST :
The following projects have good implementations that may be migrated to the JDK:

https://base64.dev.java.net/
http://commons.apache.org/codec/

JUSTIFICATION :
Base64 is largely used in Internet applications and should be supported by the JDK.


CUSTOMER SUBMITTED WORKAROUND :
Use one of the referred projects.