GitLab

Rename AdvancedGuide.md to advanced.md and adjust the links. 
Part of documentation rationalization work

move only types docs

The document itself uses lambdas later, all the scaffolding to
work around lack of lambdas should be considered for removal, but
that is much larger an effort than I can commit to.

SeArrayArgument => SetArrayArgument

The old language might mislead someone into thinking that the access level on the base class itself was changed.