Admin-only command (can be !fallowed) to spectate deadchat or wolfchat.
The person spectating is not revealed to anyone in the chat, however
they can see everyone in that chat.
If used outside of debug mode, it is restricted a la !revealroles where
it cannot be used by an alive player or an active vengeful ghost.
nyuszika7h: Fix formatting of !start votes 3222d646de08
jacob1: change "chat" to "deadchat" because it confused people e3c5897f6f2a
nyuszika7h: Add some missing periods 6aedc3935263
