[PATCH v10 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, the `IWinePropertySetImpl` implementation can 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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  v10: 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.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6766