[HEADERS]

- Move definitions for DrawCaptionTemp to userundoc.h as it shouldn't be defined in the psdk
- Add browseui_undoc.h and move there the undocumented definitions for browseui
- Add comctl32_undoc.h and move there the undocumented definitions for comctl32
- Move undocumented definitions for shlwapi to shlwapi_undoc.h
- Add shellutils.h to contain helper macros and definitions that are nor per se undocumented.
- Cleanup internal definitions of explorer. Remove several temporary hacks. They were added at a time that these features were not implemented at all.

svn path=/trunk/; revision=65507