Feature to export gene summary (curation status/notes)

* Proper formatting of implicit links to hrefs
* All references point to PubMed using PMID
* Conversion to MediaWiki using `HTML::WikiConverter`
* Basic test for mediawiki conversion role, incomplete (requires Oracle for PMID retrieval)
* Updated toolchain files with deps - `HTML::WikiConverter`, `XML::Twig`, `HTML::WikiConverter::MediaWiki`