This PR will lead us towards the Promised Day, for in its wake there shall be much celebration and ecstasy as this world becomes a world suitable for developer hegemony. The first strike is thusly;
All << is converted into to_chat().
Reworks #2689
Includes: Vent crawling up and down.
Quote from original PR:
Main feature is that ventcrawling between Z levels now works perfectly. It takes 10 seconds to climb up or down a pipe...
Ports the rat king from apollo, as an admin tool for now.
The rat king can collect mouse as he walks by, getting stronger, and unlocking some skills, it also can speak to all mouse in the world via a special skill.
