undo/redo for edit talk node

src/scenario/talking.hpp

@@ -88,6 +88,19 @@ public:
 			std::fill(link1, link1 + 4, ' ');
 			std::fill(link2, link2 + 4, ' ');
 		}
+		bool operator==(const cNode& other) const {
+			CHECK_EQ(other, personality);
+			CHECK_EQ(other, type);
+			for(int i = 0; i < 4; i++){
+				if(link1[i] != other.link1[i]) return false;
+				if(link2[i] != other.link2[i]) return false;
+				if(extras[i] != other.extras[i]) return false;
+			}
+			CHECK_EQ(other, str1);
+			CHECK_EQ(other, str2);
+			return true;
+		}
+		bool operator!=(const cNode& other) const { return !(*this == other); }
 	};
 	std::array<cPersonality, 10> people;
 	std::vector<cNode> talk_nodes;