Converts reagents to use typepaths instead of IDs.
Centralises reagent spawning in a lot of places to use reagents_to_add instead of a variety of custom methods or initialise overrides.
Converts all reagent containers to use Initialize, fixes the hand-chew cool down so it's no longer for everyone, and moves the suit sensor Z-level to the global.dm right above the station name so anyone else using the code can't miss it.
Closes#3363Closes#3361Closes#3362