[foreign] Panama EA - August 2019 edition

Hi, I'm pleased to announce that a new version of the early access Panama binaries is available: https://jdk.java.net/panama/ The jextract model was completely reworked - now jextract generates sourcefiles that are then compiled with a standard javac compiler, rather than emitting classfiles directly - this should take care of the many issues we have encountered in the past where missing (or incorrect) classfile attributes were affecting usability inside IDEs. Many thanks to Sundar and Henry for that great piece of work. We've also been busy on fine-tuning performances, especially in the case of struct access; here I'd like to thank Jorn for some great work that he put into that area. As always, please do let us know what you think - your feedback is always super welcome and appreciated. Cheers Maurizio