Rumors: avoid repeating of same rumor twice in a row

Multiple rumors of same type can go in a row, but not identical rumors.

lib/CGameState.h

@@ -219,6 +219,7 @@ struct DLL_LINKAGE RumorState
 	std::map<ERumorType, std::pair<int, int>> last;
 
 	RumorState(){type = RUMOR_NONE; last = {};};
+	bool update(int id, int player);
 
 	template <typename Handler> void serialize(Handler &h, const int version)
 	{
@@ -371,7 +372,7 @@ public:
 		{
 			h & rumor;
 		}
-		else
+		else if(!h.saving)
 			rumor = RumorState();
 
 		BONUS_TREE_DESERIALIZATION_FIX