Add support for `UIAutomationType_ElementArray` properties in the COM API, and begin adding support for creating elements from cache requests in the COM API.
-- v2: uiautomationcore: Implement IUIAutomationElement::BuildUpdatedCache. uiautomationcore/tests: Add tests for IUIAutomationElement caching methods. uiautomationcore: Implement IUIAutomation::CreateCacheRequest. uiautomationcore: Add support for element array properties in IUIAutomationElement::GetCurrentPropertyValueEx.