simplified some of the DynamicPublishedContent methods to accept Func<IPublishedContent> instead of Func<DynamicPublishedContent>, made the IsHelper method private as this shouldn't be exposed.
renamed other objects starting with DynamicDocument to DynamicPublishedContent
support for checking with case insensitivity. Example. CurrentPage.NewsItems where NewsItem is a child doc type alias.
Found one reason why the old dynamic node has performance issues and have added a note, just need to do more reseearch to
make sure my findings are correct.
Changed over all of the new DynamicNode classes to be DynamicDocument instead.
Starting writing a few unit tests for the new DynamicNode codebase. Will of course leave the original DynamicNode stuff in its
current place for backwards compatibility but will deprecate many of the classes which will call the new ones.
