Fix require_once deprecation in syntax files

Fix missing methods

The acronyms is just a wrapper, but it requires to implement the methods too.

Objekt Structure

See [DokuWiki](https://github.com/splitbrain/dokuwiki/issues/1971) - update `var` to `private`

Update to use the interanl meta section for forceToc and check the toc settings before rendering the document - other plugins might modify the settings for the TOC adhoc.

Initial GitHub version