* Fix system version checks to work properly on Mac Catalyst (which uses the macOS
version as its system version).
* Add the framework-specific defines to the build for monotouch-test.csproj (using
the generated response files), this way we can use them in the tests.
* Sprinkle conditionals in numerous places - I tried using either framework-specific
or XAMCORE_3_0 whenever that made since (instead of using Mac Catalyst as a condition).
* Updated a few tests to use non-deprecated API (because the deprecated API often
doesn't exist in Mac Catalyst).
* Also a few minor API fixes to make any corresponding tests compile.
We've modified our NUnitLite to special-case the native types, so that they
can easily be compared with the standard types, but that doesn't work anymore
when switching to the official NUnit[Lite], so change all asserts to
explicitly convert whenever needed.
* Existing `.ctor(object[])` now
* changed to `params` (not a breaking change);
* accept `NSString`, along with `string` and `UIImage`;
* Added `.ctor (NSArray)` (exposing the generated code to ease subclassing)
* Added `.ctor (params NSString[])`
* Added `.ctor (params string[])`
* Added `.ctor (params UIImage[])`
Also adds unit tests for all of them.
https://bugzilla.xamarin.com/show_bug.cgi?id=33163
Rolf Bjarne Kvinge
Timothy Risi
Sebastien Pouliot