* UdpClient PNSE 'false positives' - fixes#37
* Fixes#85 false positive RSACryptoServiceProvider.ExportParameters on Windows
* Add capability to target enums and small false positive related
* Fixes#83 (Socket.Connect and related false positives)
* Add inclusion/exclusion to PNSE
Add simple inclusion/exclusion capability to ex-gen so the set of PNSE
can be controlled as needed. Opportunistically added also a way to
process previous downloaded versions of .NET Core in order to avoid
downloading on every run - pointed to download .NET Core 2.0.0.
Per code review: the two sets of APIs in the added new deprecations
should be in PNSE (the plan being to improve on PNSE).
Paulo Janotti