* Stop using the C defines LPSHELLFOLDER, LPSHELLVIEW and LPUNKNOWN, and use the respective C++ interfaces instead.
* Change one batch of COM interface pointers into CComPtr-based pointers, and remove associated Release calls (including at least one that was not supposed to be there at all).
* Remove a couple (repeated multiple times) pointless casts.
svn path=/branches/shell-experiments/; revision=63908
[SHELL32]
* Move the IID_NULL_PPV_ARG macro to the shobj_undoc header, next to the (also ros-specific) IID_PPV_ARG macro, so that it can be used elsewhere.
[SHELL32]
* Make use of IID_NULL_PPV_ARG in all the calls to GetUIObjectOf, and fix one instance of mismatched riid/pointer.
CORE-7330
svn path=/branches/shell-experiments/; revision=63044
