Smooth out pathing issues for the CI bridge

Since Lua (and thus Mudlet) can handle its paths with / on all three operating systems, I've standardized muddler and the muddler ci bridge to use that for its path delimiter in the .output file and file watches. This way we don't have to worry about escaping the \ if it is the file separator, and that it should just work no matter what OS you run it on.

If you already have one setup using \ as the file separator it'll sub it out internally, no worries.