- Experimentally switch fastfat driver to non-Ros Cc functions, and thus no FSD in...

- Experimentally switch fastfat driver to non-Ros Cc functions, and thus no FSD in ReactOS are using CcRos-specific functions anymore.
- Assume VACB_MAPPING_GRANULARITY as a default cache segment size.
- Use FSD callbacks instead of direct accessing FCB's MainResource via FileObject/FsContext. This allows removing of ObReferenceObject(FileObject) which I had to add some time ago in order to keep FileObject alive for the lazy writer thread.
- IMPORTANT: Testers should thoroughly try this revision in order to see if any new problems appear. If they do appear, this revision will most probably be reverted by me.

svn path=/trunk/; revision=32612