USER32: modify CURSORICON_FindBestIcon/Cursor to use enumerator functions

[Mike McCormack]

This patch prepares for the removal of the 
CURSORICON_SimulateLoadingFromResourceW hack.

CURSORICONFILEDIR and CURSORICONDIR defined in include/cursoricon.h are 
nearly identical structures describing cursors or icons stored in a file 
or resource respectively.

Currently the differences between these structures is handled by 
converting the cursor/icon data stored in a file to the same structure 
as that stored in a resource, then loading it as a resouce.

This patch modifies CURSORICON_FindBestIcon/Cursor to accept an 
enumerator function that deals with the small differences between 
structures.

Mike


ChangeLog:
* modify CURSORICON_FindBestIcon/Cursor to use enumerator functions
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