RFR: 8067661 transferTo() for Appendable

[Patrick Reinhart]

After discussing [0] for about the API for the new transferTo() method on Appendable, I have created an initial
Version of the actual implementation for review:

http://cr.openjdk.java.net/~reinhapa/reviews/8067661/webrev.00/index.html

Any comments/suggestions are welcome, also I will need a sponsor for it at the end…

-Patrick

[0|] http://mail.openjdk.java.net/pipermail/core-libs-dev/2017-November/049797.html