* [CoreGraphics] Add first batch of Xcode10 APIs, added an enum that we did not surface before
* [xcode10] CoreGraphics support
* Fix whitespace/formatting and add comma after last enum value.
* Make CFPropertyList follow normal INativeObject creation pattern.
* Make CFPropertyList.AsData return the error as a tuple.
* Fix CFPropertyList.AsData to not leak.
* CFPropertyList.Value: use Runtime.GetNSObject so that we don't accidentally create duplicate wrappers for the same native object.
* [CoreGraphics] Update to beta 5.
* Update xtro definitions.
* Add tests.
* Don't compare value type with null.
* Use PascalCase for named return tuples.
* [CoreFoundation] Make CFPropertyList enums native and fix code accordingly.
* [tests] Fix fetching 64-bit int to actually fetch a 64-bit int and not a nint.
* [tests] Teach introspection's ApiCMAttachmentTest about CFPropertyList.
* Not every old annotations have been migrated (work in progress, to be completed in another PR);
* Sanitation of the data files (e.g. removal of dupes and fixed, by Apple, entries) is done, but not automated (also a work in progress)
Even then this is immediately useful, i.e. better merged before 15.6 gets branched.
Miguel de Icaza
Sebastien Pouliot