Fix up a bunch of Windows build issues:

Fix up a bunch of Windows build issues:
- Remove iButton vcproj; it's less hassle to integrate it into the main build
- Remove "VersionSVN" boolean from verinc.c
- Move verstub.cpp to pre-link, add git verinfo.h to pre-build
- Reinstate VersionNumber/VersionTime for Windows builds
- Make OpenITG explicitly dependent on libtomcrypt/libtommath