[FEATIRE REQUEST] Sorting by filename

[Chrosbahr]

Currently there are two sort options, both related to date (newest first and oldest first). It would be nice to have the option to sort by filename as well. My main use cases for this are:

1. I often have folders containing photos from several cameras, that are not always on the right date/time
2. I regularly create curated folders of photos, where I want to re-arrange the order manually

[Chrosbahr]

If it makes a difference: I am thinking about "external libraries" folders here :)