shell32: better modularization

[Juan Lang]

Apologies for the size of the patch.  With it I'm
trying to prevent the lights from dimming every time I
touch a file in shell32 because everything gets
recompiled.

Includes this patch:
http://www.winehq.org/hypermail/wine-patches/2004/04/0032.html
and independent of my other shell32 patches.

ChangeLog:
- move EnumIDList enumerations into their respective
files
- move most PIDL constructors into their respective
files
- remove some unneeded special cases in
SHGetSpecialFolderLocation, and document those that
remain
- fix handle leak on error in CreateFolderEnumList,
and only iterate through a directory once

Martin, it doesn't appear these collide with your most
recent set of patches, but let me know if they'll
cause an issue.

--Juan

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