replace wiki markup by html - links (2/5)

fe 60requested to merge
fe60/fdroiddata:replace_links_2 into master

Set of 5 commits replacing links formatted with wiki markup.

Commit 1-3 replace links only the URL has been provided for.
[URL] becomes <a href="URL">URL</a>

Commit 4 and 5 replace links providing text for the links.
[URL some text] becomes <a href="URL">some text</a>

Merge request reports