Use the game queues in campaign mode

[past-due]

The game queues are partially used in campaign mode, but some special cases exist. Let's see if removing them is a problem.

Current changes:

• order.cpp: Remove special case for campaign
  • In orderDroid, orderDroidStatsLocDir, orderDroidStatsTwoLocDir

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Some other suspicious things that need investigation:

warzone2100/src/droid.cpp

Lines 292 to 303 in 60d4ebc

	// This should be sent even if multi messages are turned off, as the group message that was
	// sent won't contain the destroyed droid
	if (bMultiPlayer && !bMultiMessages)
	{
	bMultiMessages = true;
	destroyDroid(psDroid, impactTime);
	bMultiMessages = false;
	}
	else
	{
	destroyDroid(psDroid, impactTime);
	}

(Possibly because of removeDroidBase->assignFactoryCommandDroid->secondarySetState, which has a if (bMultiMessages && mode == ModeQueue) check?)