* Change the IOperation unit test dump format for child nodes

* fixing the newly merged tests.

In the new SDK we no longer have a need for ProjectGuid. This change
will:

- Remove ProjectGuid from project files
- Remove Name + Project items from ProjectReference entries
- Change BuildBoss to enforce both of these items

Fixes https://github.com/dotnet/roslyn/issues/19954 and https://github.com/dotnet/roslyn/issues/20125

FieldInitializerInCreation and PropertyInitializerInCreation are no longer used, so this change removes them.
Fixes https://github.com/dotnet/roslyn/issues/19300

Fixes https://github.com/dotnet/roslyn/issues/20312

See https://github.com/dotnet/roslyn/issues/18781#issuecomment-311428609 for the final design.
Fixes #18781

Some test projects have checked in cs\vb files as test assets. Group them with None\Content and add comments to the effect that they are valid removes.

added vb unary operator tests

Migrated the remainder of our code base to use the new SDK via the
ConvertPackageRef tool.

https://github.com/jaredpar/ConvertPackageRef