[Request] Improve wikimedia/wikipedia support

[snowbie]

For example, when viewing a page like this, have it behave similar to yt-dlp such that it'd download all the images on the page (preferring the "Original File", not thumbnail.)
Example page for wikimedia, which should be the easiest of the two
Originally this request was going to be for wikimedia only, but apparently that flag page is a wikipedia page with the images themselves hosted on wikimedia.

[mikf]

There is a rather old PR that would add proper wiki* support (#2340), but I haven't had time or energy to properly review it yet ...