Create an extension that simply lists the version of Meza

[freephile]

Feature request

Based on feedback at nasa#36 Meza should have the version information displayed on-wiki. Logically this would be the Special:Version page, and by extension (no pun intended) that means creating an extension which gathers and outputs the information.

Implementation

See https://www.mediawiki.org/wiki/Manual:Special_pages and https://www.mediawiki.org/wiki/Manual:Developing_extensions#Learn_by_example (including the "Learn by example" section)

We may want to create a parser tag or make the specialPage transcludable so that authors can display the Meza version in content on-wiki

[freephile]

This extension, called the 'Meza' extension, should also take care of basic housekeeping like setting up the section 508 footer link.

nasa@1697c20

https://www.mediawiki.org/wiki/Manual:Footer#Add_links_to_the_footer

The problem with the above commit is that this adds a red link (to a non-existent page), and uses an empty (undefined) i18n message.

It would be good to have the 508 page live in the Project namespace; and pre-define both the content and the link text.

The Meza extension - hosted on GitHub in the NASA org - possibly registered with Gerrit / code search and with a page on mw.o