Add a mediawiki API fetcher.

Applicable to wikihow. Also clean up the code to reduce duplication
with fetching and finding files. And fix when the wiki entry is under
a directory naming itself which is common in mediawiki: both foo and
foo/bar could be a valid wiki title. So locally files need to have an
extension (by default .wiki). Also add the extension to
auto-mode-alist.

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