use kcoreaddons to split fdupes output. fdupes outputs
/space\ inbetween/x.svg /space\ inbetween/y.svg
as dupe result, which, if we split blindly for space, we'll split into 4
pieces instead of 2.
splitting the argument string using escape rules via kshell gives us
correct splitting by taking into account the escaped spaces.
unfortunately qregex doesn't seem to support negative lookbehind
expressions, or we could solve this with a (?<!\\\\) instead of having
to use kshell.