The JRE (since Java 6) ships with a perfectly good Base64 Encoder/Decoder. Use it.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1458726 13f79535-47bb-0310-9956-ffa450edef68
Replace Tomcat's own base64 encoder with the one from the JRE.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1458738 13f79535-47bb-0310-9956-ffa450edef68
Add note on removal

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1458739 13f79535-47bb-0310-9956-ffa450edef68
Remove deprecated code

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1458740 13f79535-47bb-0310-9956-ffa450edef68