Natural sort by trailing number

**is your feature request related to a problem? Please describe.**
I store some of my manga using copyparty and they are always name something similar to this "My Manga Title_1.png", "My Manga Title_2.png", "My Manga Title_3.png" and so on. If the Manga title itself has digits nsort seems to break. It also sometime breaks if the Manga title has no digits in it.

**Describe the idea / solution you'd like**
Have an alternative to the default nsort which sorts by leading digits.