reroute config: Screen lock shortcut.
reroute: Add next API; re-implement screensaver toggle.

Amazingly awkward. How have we reached a situation where it doesn't seem
possible to programmatically and definitively answer the question "what window
manager am I currently running?"? I'm not sure what more to say about this,
it's just so mind-blowingly stupid.
vim: w! sudo tee trick.