Reimplementation of SHGetPathFromIDListA/W() using the new helper
functions SHELL_GetPathFromIDListA/W(). The new implementation avoids
using IShellFolder::GetDisplayNameOf(), so that it
- returns the absolute file system path, not relative to the dekstop
- returns FALSE as error code if the path can not converted in a valid
  file system path
- doesn't return virtual CLSID paths