Added db_mysql_live which allows Anope to pull data

from the four main SQL tables in realtime, which
effectively gives us "live" SQL.
Changed eventfd pipe engine to not use buffered write.
Added TryLock to threading engines.
Made blocking SQL queries in our SQL API thread-safe.

modules/socketengines/m_socketengine_poll.cpp

@@ -162,7 +162,7 @@ class SocketEnginePoll : public SocketEngineBase
 				s->SetFlag(SF_DEAD);
 		}
 
-		for (int i = 0; i < total; ++i)
+		for (int i = 0; i < SocketCount; ++i)
 		{
 			pollfd *ev = &this->events[i];
 			Socket *s = Sockets[ev->fd];