* Pass any native references to the LinkNativeCode task so that they're linked
with the main executable.
* Copy frameworks and dynamic libraries to the app bundle (also add support
for MSBuild metadata - the CopyToAppBundle property - to avoid copying a
framework / dynamic library to the app bundle).
* Refactor MTouchTaskBase a bit to make parts of it reusable from the
LinkNativeCode task.
* Add tests.
Fixes https://github.com/xamarin/xamarin-macios/issues/11061.
aad913db86