This replaces several sanitizeSQL calls with ckey calls, which
effectively sanitizes on its own.
Admin ckeys are not ckeyized if they don't actually match the admin's
ckey, which only really happens with specific automated notes.
Currently, to_chat is literally just a proc that does user << message.
But it'll let us do output modification in the future, especially for
something like Goon's HTML chat.
Big thanks to PJB for his to_chat script, see
https://github.com/d3athrow/vgstation13/pull/6625 for more details.
