Feature idea: Allow filtering/sorting of image list

[BDGreyson]

I found the program when looking for a specific purpose: I'd like to "import folder" and convert all PNGs to PNGs with the highest PNG compression level.

This is no problem if I pre-filter the images to only PNGs. But with mixed folders I'd have to manually unselect all the non-PNGs so that, for example, JPGs are kept untouched.

This would be much easier, and faster than pre-filtering the folders, if I could sort the "to convert" image list by, for example, clicking on the column headers.

Alternatively I'd also be fine with an option menu which allowed me to set "only apply to filetype x", but I assume as the column headers are already there, maybe just sorting through them would be more intuitive.

Once sorted I could easily select/unselect with shift-selecting and the check/uncheck option.

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Thank you very much for your work either way!