Add CodeStyle option to allow users to customer the 'Invoke Delegate With Conditional Access' analyzer.

Now that feature names aren't used for serialization anymore, we can
just get rid of the constants and use the containing type name.
Also, update more options to use nameof where appropriate.

Now that we have an API for associating persistence information,
we can put that information on all our options we persist today.
We'll consume this in a future commit.

and plumb them through the UI, persistence, analyzer/fixer and
other parts of the system. update the simplifier to use the new options.
update codegen features as necessary.