Re-add the "lake.bmp" wallpaper inclusion (partly imported from the deleted 0.3.1...

Re-add the "lake.bmp" wallpaper inclusion (partly imported from the deleted 0.3.1 branch, r26044)
The wallpaper is now also added to the %SystemRoot% directory instead of %SystemRoot%\system32

The only thing I did not import is the setting of the default wallpaper in "hivedef.inf". For 0.3.1, we hardcoded the full path to the wallpaper in the "hivedef.inf" file.
For 0.3.3, we should either do this only in the branch or better implement a proper solution like setting the path in 2nd stage setup.

svn path=/trunk/; revision=27250