Much better narration/dialogue/action handling (and for lua too)

src/gamedata/GUIModuleCommon.h

@@ -2,6 +2,7 @@
 #define __GUIMODULECOMMON_H__
 #include <iostream>
 #include <Ogre.h>
+#include <nlohmann/json.hpp>
 #include "Components.h"
 #include "GameData.h"
 namespace ECS
@@ -21,6 +22,7 @@ struct GUI {
         Ogre::String mnarrationText;
         std::vector<Ogre::String> mchoices;
         int narration_answer;
+        nlohmann::json props;
 
     private:
         bool complete;
@@ -91,6 +93,18 @@ struct GUI {
             event(ev);
         }
         virtual ~NarrationHandler() {}
+        void setProperties(const Ogre::String &properties)
+        {
+            props = nlohmann::json::parse(properties);
+        }
+        Ogre::String getProperties() const
+        {
+            return props.dump();
+        }
+        const nlohmann::json &getPropsJSON() const
+        {
+            return props;
+        }
     };
 
     static void setWindowGrab(bool g = true)