It would be possible to make single-project support nicer if it was possible to generate a partial Info.plist that is to be merged into the final Info.plist (for fonts at the very least).

The idea would be to add an additional public itemgroup like the current _PartialAppManifest that is passed to the CompileAppManifest task + a target that can be used for BeforeTargets.

• Add tests
• Modify our build logic to use PartialAppManifest instead of _PartialAppManifest.
• Documentation: https://github.com/xamarin/xamarin-macios/wiki/Project-file-properties#partialappmanifest

/cc @Redth