Core16 GPU core approaching end of life

Our projects which use Core16 have completed and this means that Core16 is reaching its end of life, as the Core17 GPU core has some key features needed in new projects.  We do not have an ETA for the last Core16 WU, but it is likely soon, i.e. in a week or two.

One outstanding issue for Core17 is that while it has much greater performance for most AMD GPUs, it has been reported that PPD is slower for 5xxx class AMD GPUs.  We have been brainstorming fixes for this issue internally, but we have no solution for improving this unfortunately.  We are continuing to discuss this internally to see what we can do.