Add support for .jfif files

**Is your feature request related to a problem? Please describe.** I just would like to have this compatibility. I often find myself with these kind of files (JFIF, HEIC, the likes) and it would be nice to be able to organize them without having to convert them **Describe the solution you'd like** Have it so image sort supports these **Describe alternatives you've considered** Converting the files to png, which sometimes may mean metadata is lost or modified (namely creation dates for example) **Additional context** None