More fixes for map-specific crashes, fixes #1427 and #733

- if special victory condition is present AND there is only one player
normal victory condition will be disabled
- added new triggered condition, constant value
- if target of CONTROL/DESTROY condition is removed from map, triggered
condition will be replaced with constant
- fixed randomization of armies with random stacks

lib/CGameState.cpp

@@ -2464,6 +2464,10 @@ bool CGameState::checkForVictory( PlayerColor player, const EventCondition & con
 			else
 				return false;
 		}
+		case EventCondition::CONST_VALUE:
+		{
+			return condition.value; // just convert to bool
+		}
 	}
 	assert(0);
 	return false;