Win32: Update the aura.vcxproj file.

Include path changed so VS2013 had trouble finding StormLib.h.
StormLib: Make the project link against StormLibRUS and stop supplying precompiled StormLib.

This also means StormLib is now added now to the aura-bot solution and
is built before the aura project itself. Regarding Unicode filenames on
Windows, it's probably broken.