Support custom localized control types in UIA

[mwcampbell]

UIA doesn't have direct control type equivalents for all AccessKit roles. For that matter, AccessKit doesn't have roles for all control types I've seen, e.g. in the Druid widget gallery. But UIA does have a LocalizedControlType property that we can use to provide custom control types as strings. One question is whether AccessKit should provide its own localized control types, or delegate that to the application. Different applications and higher-level frameworks will have their own approaches to localization, and that might not be something that we want to take on ourselves.