RFR: JDK-8229815: Upgrade Jline to 3.12.1

[Jan Lahoda]

Hi,

I'd like to upgrade the internal JLine to 3.12.1.

Webrev:
http://cr.openjdk.java.net/~jlahoda/8229815/webrev.full.00/

In case it would be useful, there is also a webrev which shows changes 
done to the original JLine 3.12.1 sources here:
http://cr.openjdk.java.net/~jlahoda/8229815/webrev.reapply.00

These are basically re-application of the current JDK-specific changes, 
with the exception of adding a license header to JnaSupportImpl.java.

JBS: https://bugs.openjdk.java.net/browse/JDK-8229815
The patch should also resolve:
https://bugs.openjdk.java.net/browse/JDK-8219206

How does this look?

Thanks,
     Jan