UiaInt's copy ctor should create a new remote copy too

[mlalic]

UiaInt's copy constructor works differently from its assignment operator, in that it simply creates an "alias" for the same remote object, rather than creating a new "deep" copy. Not only should the copy ctor always work the same way as the assignment operator, but this is definitely unexpected behavior for consumers.

While a workaround exists, we should still fix this.