RFR: 8170769 Provide a simple hexdump facility for binary data

[Vincent Ryan]

Hello,

Please review this proposal for a new API to conveniently generate and 
display binary data using hexadecimal string representation.
It supports both bulk and stream operations and it can also generate the 
well-known hexdump format [1].

This latest revision addresses review comments provided earlier.
These include adding methods to support for data supplied in a 
ByteBuffer, exposing the default formatter implementation as a public
static and dropping the superfluous 'Hex' term from several method names.

Thanks


Bug: https://bugs.openjdk.java.net/browse/JDK-8170769
API: 
http://cr.openjdk.java.net/~vinnie/8170769/javadoc.06/api/java.base/java/util/Hex.html
Webrev: http://cr.openjdk.java.net/~vinnie/8170769/webrev.06/


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[1] https://docs.oracle.com/cd/E88353_01/html/E37839/hexdump-1.html