Shell32: Reimplement SHGetFolder functions

[Juan Lang]

Sorry for the size of the patch.  I've reimplemented
SHGetFolderPath and its cousins based on testing in
WinXP and documentation.  The high-level improvements
are:
- the correct registry location to override is User
Shell Folders, not Shell Folders
- if User Shell Folders doesn't exist in HKCU, HKLM
should be tried
- SHGetSpecialFolderPath should call SHGetFolderPath,
not vice-versa
- the default values should be localizable
- some of the parameter checking and returned
LPITEMIDLISTs were a bit off

This updates and supercedes the conformance test patch
I sent earlier:
http://www.winehq.org/hypermail/wine-patches/2004/09/0158.html

--Juan


		
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