[PATCH v2 0/19] MR6766: dlls/wintypes: Implement Windows.Foundation.Collections.PropertySet.

[Vibhav Pant (＠vibhavp)]

The implementation is backed by a smaller `IWinePropertySetImpl` interface for core operations (insertion, lookup, removal, iteration), which currently uses an `rb_tree` to store `HSTRING`-`IInspectable *` value pairs.

If needed, this could be later swapped out with a hash table for performance reasons, as `PropertySet` does not have an enumeration order guarantee, at least according to the MSDN docs.

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  v2: dlls/wintypes: Implement IMapView methods get_Size, HasKey, Lookup, Split for PropertySet.
      dlls/wintypes: Invoke MapChanged event handlers from PropertSet on entry removal and Clear().
      dlls/wintypes: Invoke MapChanged event handlers from PropertySet on insertion.
      dlls/wintypes: Implement get_Current() for the IIterator implementation obtained from PropertySet.
      dlls/wintypes: Implement IIterator methods MoveNext() and get_HasCurrent() for PropertySet.
      dlls/wintypes: Implement IMap method GetView() for PropertySet.
      dlls/wintypes: Implement IMap methods HasKey, get_Count and Remove for PropertySet.
      dlls/wintypes: Implement IMap method Clear() for PropertySet.
      dlls/wintypes: Implement IMap methods Insert() and Lookup() for PropertySet.
      dlls/wintypes: Implement adding/removing IMapChangedEventHandlers for IObservableMap<HSTRING, IInspectable *>.
      dlls/wintypes: Add stubs for IKeyValuePair<HSTRING, IInspectable *>.
      dlls/wintypes: Add stubs for IIterator<IKeyValuePair<HSTRING, IInspectable *>>.
      dlls/wintypes: Add stubs for IMapView<HSTRING, IInspectable *>.
      dlls/wintypes: Add IIterable<IKeyValuePair<HSTRING, IInspectable *>> stubs to PropertySet implementation.
      dlls/wintypes: Add IObservableMap<HSTRING, IInspectable *> stubs to PropertySet implementation.
      dlls/wintypes: Add IMap<HSTRING, IInspectable *> stubs to PropertySet implementation.
      dlls/wintypes: Add stub for Windows.Foundation.Collections.PropertySet.
      dlls/wintypes/test: Add conformance tests for Windows.Foundation.Collections.PropertySet.

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Please visit the URL below to see the contents of the merge request.
https://gitlab.winehq.org/wine/wine/-/merge_requests/6766