Syntax for line:col jumps in QuickOpen search queries

Hey, @TomMalbran, this overtakes #3238. I finally got around this long forgotten pull request. I've cherry-picked the old commits on top of master and added some tests. I may be a little bit rusty, so please, check if everything's in there or if I missed something.

@peterflynn @dangoor I've seen that the test gave some issues in the past, so you may want to check it out