request: set file ordering like ls

[noib3]

Basically title. I know we can set the file ordering as natural, based on file extensions, time, etc., but I'd be nice to have an option to mimic the ordering of ls, which can be customized in various ways.

[gokcehan]

@n0ibe Can you be more specific? Which options of ls are you looking for?

[noib3]

Two options really (I'm using set sortby ext):

1. hidden directories should be listed before visible directories. It already works for regular files, i.e. .a.txt is listed before a.txt, but .a is listed after a (where both .a and a are directories). I'd be nice to have consistent ordering across all filetypes;

2. sort uppercase before lowercase, i.e. A then B then a then b.

[gokcehan]

Second point also mentioned in #320.