No change in beta 2 to 5
* Run EmbeddingTest.Vector test on iOS and macOS only
reference: rdar 44948030
> Engineering has the following feedback for you: The tagging
> depends on the NLP assets being present on the device. The
> assets get downloaded through OTA. OTA download for NLP assets
> does not exist on watchOS and tvOS currently…only on iOS and
> macOS. It is conceivable that the assets got downloaded when you
> were on WiFi at a later point. So, the tagging should work.
The dispose of `nslang` was happening outside of the check if `nslang` is null. This was causing a crash when trying to recognise a string that contains just one number.
* Move `NLTag` to static class (instead of enum) since it's not used in API, except along NSString. Fixes https://github.com/xamarin/xamarin-macios/issues/4774
* Add new member to `NLLanguage` to avoid `ArgumentNullException` when it has not been evaludated (API returns `null`), see unit tests;
* Add `[Params]` to `NLTagger` constructors so they are easier to use (no need to create the array in source);
* Fix `GetTag` so it returns (`out`) the `NSRange`, it's natively a `NSRangePointer`;
* Fix `GetTag[s]` API with changes to `NLTag` de-enumification;
* Add unit tests
Rolf Bjarne Kvinge
Sebastien Pouliot
monojenkins
Manuel de la Pena