fix unwrapping types from the abi

[stevenbrix]

unwrapping classes from the ABI was tied to unsealed classes only. this was done as a way to create the proper derived type from an API which returns a base type.

support was added to unwrap interfaces through MakeFromAbi, this expands that to support all classes

Changes

1. Modify MakeFromAbi to be a method implemented on the module. there are too many exports otherwise.
2. Add methods to create types and interfaces from the abi
3. deleted duplicate testAggregation method

Testing

Updated my local build of Arc and was able to remove some workarounds we have

Fixes WIN-794

[linear]

WIN-794 creating a sealed class from an API which returns a base type doesn't work

example:

AppWindow.Presenter property returns a AppWindowPresenter type and the default value is an OverlappedPresenter but since OverlappedPresenter is a sealed class we don't create makeFromAbi implementation for it and you aren't able to cast

[tristanlabelle]

I think I made enough sense of it to sign off!