Add MediaWiki markup support

[ghost]

Add MediaWiki markup support for notes

File extension: *.wiki

• https://www.mediawiki.org/wiki/Markup_spec
• https://en.wikipedia.org/wiki/Help:Wiki_markup
• https://en.wikibooks.org/wiki/MediaWiki_User_Guide
• https://en.wikibooks.org/wiki/Editing_Wikitext
• https://stackoverflow.com/questions/9824489/any-markdown-to-wikimarkup-converter-available
• https://openwetware.org/wiki/Converting_documents_to_mediawiki_markup

P.S.: https://en.wikipedia.org/wiki/Ikiwiki

[tamlok]

VNote is extensible to support another file type, but it will be another story (I need to re-estimate my time and energy). For now let's just focus on Markdown. :)

[ghost]

For now let's just focus on Markdown.

Firstly work on Markdown, of course!

Adding MediaWiki markup is long-term feature request ;-)