Point to quyykk's editor

[TheGiraffe3]

Summary

Changed the link in MapData to point to quyykk's editor, as the normal one is years out of date.

[TomGoodIdea]

If we're not planning to update the "official" editor, its repo should be marked as archived IMO, or at least there should be a visible note that it's no longer maintained.

[TheGiraffe3]

There was an issue asking for that as well: #43

[mOctave]

Since Quyykk seems to have abandoned the plugin editor and mostly moved away from ES, should we be reconsidering this? Or is there a way to transfer ownership of the editor to the endless-sky org?

[TheGiraffe3]

I believe that quyykk has to move it.
But his editor is still better then the official one at this point.

[mOctave]

By the way, Quyykk's editor is now old enough and outdated enough that it no longer runs on MacOS. That means that, as of right now, it is no longer better than the official one for anyone running MacOS (still not worse, because the old one needs custom building too, but...)

[TheGiraffe3]

By the way, Quyykk's editor is now old enough and outdated enough that it no longer runs on MacOS. That means that, as of right now, it is no longer better than the official one for anyone running MacOS (still not worse, because the old one needs custom building too, but...)

It works on my computer, which is a Mac.