We don't need the split anymore now that we're only supporting Dev15.

Unfortunately this required the introduction of a NuGet package that
has a namespace "Workspace" to our VS project, which meant I had to
disambiguate Workspace wherever it's used in that layer. I considered
doing an extern alias instead to disambiguate, but applying that to a
ProjectReference isn't supported. That's tracked by NuGet/Home#4989.

* Rename Foo to Goo

* Rename ifoo to igoo

* Add back BOMs

Enable few more rules and fix issues identified these rules.

Also added issue IDs for the disabled rules due to lack of a fixer/fix all experience.

in Dev14 these options were persisted as booleans. They are now persisted as xml in Dev15.  The fix is to not have the persistence keys overlap, ensuring Dev14 will not try to deserialize Dev15 options and vice versa