R1:13155f88289d

Add symbol integration to the IRC bot

Summary: Allow the bot to answer the question "where is X?", where X is a
symbol.

Test Plan:
phabotlocal joined the chat room.
epriestley: phabotlocal: where is DarkConsole?
phabotlocal left the chat room. (Remote host closed the connection)
phabotlocal joined the chat room.
epriestley: phabotlocal: where is DarkConsole?
phabotlocal left the chat room. (Remote host closed the connection)
phabotlocal joined the chat room.
epriestley…