Expand on current Showcase implementation

A welcome improvement to the current Showcase implementation, would be the ability to create shelves of images; in more UI oriented terms I am envisioning 3-5 total rows of showcased images with individual headers.

I think fewer than three would largely defeat the point of an update, and more than five would risk cluttering a profile to the point it's generally unpleasant to navigate; regardless the end user should have the ability to define the number they'd like to utilize (i.e. up to five at most, with as little as one [or none]).

This would enable showcasing by category; so one might have “Anime”, “Realism", and “Landscapes” categories.

By extension it'd also enable separating sfw and nsfw images (as someone who generates primarily nsfw, I do occasionally get sfw results I'm very satisfied with; but am reluctant to add them to my current showcase as they lack congruence).

An alternative to this suggestion would be allowing 3-5 collections to be displayed on the profile with inherited headings (i.e the title of each respective collection), and giving them the same sort of carousel behavior.