New name TBD.

• Replace all instances of "GVFS" and "VFSForGit" (and variants) in the filenames using an exact-rename commit.
• Drop the base "GVFS" folder in the same commit.
• Perform text-based replacement of "GVFS", "VFSForGit", and variants in most places (some things need to stay, such as the Git package name).