Refactor reader/writer/pinger

The old code relied on a global bool for reconnect synchronization; this
would cause the reader/writer to stop (and not restart) on every other
`IRCConnection` when one was `Reconnect`d. This patch renames the
methods to indicate they loop, makes them methods on `IRCConnection`,
and uses a member of `IRCConnection` for synchronization rather than a
global.

src/irc_struct.go

@@ -19,6 +19,8 @@ type IRCConnection struct {
 	socket net.Conn
 	pread, pwrite chan string
 	syncreader, syncwriter chan bool
+	reconnecting bool
+
 	nick string //The nickname we want.
 	nickcurrent string //The nickname we currently have.
 	user string