As discussed on plasma-devel, this patch imports the kioslaves from plasma-workspace (remote://, application:// and desktop://) in kio. At least remote:// is used also by Dolphin, so the idea is that this move will make possible to remove plasma-workspace as runtime dependency for whoever is using those slaves.
This patch just imports the kioslave folder (+ history [1]) from the root of plasma-wrokspace to the root of kio, but doesn't build it yet. I will do that in another commit (I'll also need to move the 3 slaves to src/ioslaves/).
[1] I used this script: https://gist.github.com/tsayen/f1c1c4d62d4fda77abf1586bd39f9b74