Post-Binder Refactor Cleanup

Now that the bulk of the Binder is refactored it is time to start cleaning up around it. This is just a bunch of deletion of dead code or changes to the code to delete more code. This was a good stopping place before I started tackling the `ChainPackageInfo` class that is the heart of darkness of the `BindBundleCommand`.
Yes, but this is the same pattern used in most of WixToolset.Data.Rows that will eventually need to be reconciled. The "AsString()" is intended to be used when the data isn't fully known. Blah.