Issue tracker cleanup

Cross-posting from the devel list for visibility.

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In a round of cleanup of the issue tracker, Aklis and me have been updating many issues today. One important set of issues we worked on are the ones listing other issues, a good way to track overall progress and pending tasks. So far we have worked on:

#10056: List of Abrowser & Icecat issues
#10004: List of privacy issues
#5052: List of branding issues
#8038: List of FSDG issues (7.0 Version)
#5311: List of FSDG issues (6.0 Version)

If you know of any other meta-issues we may have overlooked, please tell.

Some notes:

* When linking to an issue, you can and should use [#1234] with the issue number, instead of making an html link. That is not only simpler but makes the links show the issue status, and they update automatically.
* Issues that get listed on this kind of meta-issues should not be marked as duplicates, as that defeats the point of marking issues as duplicates. Duplicate means "ignore". Issues that were marked that way are now set as "active".
* We have renamed the mentioned meta-issues, to "List of * issues", so they are easier to find.
* I've cleaned up and condensed the comment threads in those issues, in most cases by grouping the issues by author, but in some cases I put everything in the first comment and deleted the others, for cleanliness sake. Don't read anything personal in it ;)
* I think the two FSDG related lists should be merged. Discuss.

The next steps are going to be towards simplifying the tracker in general, to avoid some confusing points (like statuses, priorities, categories and components), implementing a triaging system, and adapting the workflow to use with the git repos and merge requests.