[SHELL32]

[SHELL32]
-CRegFolder: Implement CRegFolder::EnumObjects. Change its constructor to receive an extra parameter for the name of the key that should be enumerated.
-CEnumIDListBase: Add a new method called AppendItemsFromEnumerator to facilitate merging the contents from one IEnumIDList to another.
-Use the above in the enumerators of CControlPanelFolder, CDesktopFolder and CDrivesFolder to make them significantly simpler.

svn path=/trunk/; revision=75360