Added dynamicMemberLookup support

[jayrhynas]

This PR leverages dynamicMemberLookup to allow setting properties in the same style as SwiftUI.

Unfortunately DML cannot be implemented by a protocol so the implementation needs to be duplicated between the conforming types (UIViewContainer and ModifiedUIViewContainer)

[jayrhynas]

The one downside of this approach is that any UIKit properties that have the same name as a View modifier won't be available via DML, but you can still fall back to set(_:to:) (for example with a wrapped UILabel you cannot set the font as it tries to use View.font(_:Font))