Allow author to designate a post as "anyone can edit", for canonical posts

[cellio]

Requested on meta: https://meta.codidact.com/questions/278386.

We should avoid the term "community wiki", which was sometimes confusing on Some Other platform too. If we need a name for the type of post that has this designation, we could call it "freely editable" or "shared resource" or something else.

The author of a post should, at creation time or in an edit, be able to designate a post as having this status. The author shouldn't be able to reverse this setting later, so there should be a suitable warning in the UI. (We probably want to give mods a way to reverse it, to handle accidents.)

Setting this status should have the following effects:

• The post is labelled somehow in the UI as being freely editable.

• The usercard is changed or replaced in some way. Maybe it becomes a list of editors like Somewhere Else, or maybe it's a generic symbol (with an informative tooltip) and you can see editors in the history.

• Anybody with the Participate Everywhere ability can edit the post without the edit having to be reviewed. Users without this ability can suggest edits as usual.

• The post does not contribute to anybody's "post score" computation (for abilities) or reputation.

• MAYBE: change the license type? I'm not sure what would be suitable here. At the very least, "attribution" seems murkier with this kind of post.

I propose that the post remain "owned" by the creator -- it shows up on the creator's profile and the creator receives notifications from it. (Editors, of course, have those edits in their activity.) We will need to add a check to the computation of post score for abilities, but at least you'd be able to find that thing you remember writing.

[galegosimpatico]

priority: low?
complexity: hard?

[luap42]

I’m giving this medium priority, because I associate “low” more with “nice to have, but not necessary” and because this feature might be necessary for some communities (for example: Wiki category).

Complexity is average. Requires mostly some more “cosmetical” than functional UI changes to indicate wiki status and adding a check to every post types UPDATE route, so that we don’t skip to suggesting an edit for users without editing Abilities on wiki posts.

[cellio]

I propose that the posts remain owned by the creators rather than fussing with ownerless posts, and updated the description accordingly.

[ArtOfCode-]

This doesn't work quite as described here, because doing this as-described would be messy and involve more migrations on the Post table, so... maybe not.

Instead, I've opened the door for communities to request a "Community Resource" post type, which functions as any other post type and could be allowed in specific categories or all categories - still looks much the same other than the post type badge, but can be edited by anyone with the unrestricted ability.

[cellio]

Oh, that's cool -- this supports resources and wikis, which is a big help. The desire to do it for answers is much less frequent, I'd say, and we'll probably want to create a community-proposal type instead of using editable answers for that. (Need to think that one through more.)

I assume this is a top-level post? If it's like article but freely editable, is it possible to convert articles to community posts? (I'm thinking of L&L's resources category.)

[ArtOfCode-]

There's no tool for it, but I could do it manually if folks there want all of them to be changed to that.