Add named sections

[rossjrw]

https://scuttle.atlassian.net/browse/WDBUGS-152

[danieltharp]

Go ahead and make the relevant changes in the render class as well.

[rossjrw]

For sure, this isn't close to finished. I'm anticipating there's going to be a bunch of stuff to change on wikidot's side as well.

[rossjrw]

https://github.com/scpwiki/wikidot/blob/3c5346ab0228e914e89c99881ac61013f418c6ed/php/modules/list/ListPagesModule.php#L565

            $this->_tmpSplitSource = preg_split('/^([=]{4,})$/m', $source);

Really, wikidot?

The separator detection is duplicated between text_wiki and other parts of the codebase that need different sections. Listpages lliterally reads the page content looking for ==== and splits the text.

I could go ahead and change what listpages is looking for, but how can I be sure that it's the only part of the codebase that does this?