Moved gun data into databases jsons, made core read from databases

src/core/include/aircraft.h

@@ -6,6 +6,11 @@ class Aircraft : public AirUnit
 public:
 	Aircraft(json::value json, unsigned int ID);
 
+	static void loadDatabase(string path);
+
 	virtual void changeSpeed(string change);
 	virtual void changeAltitude(string change);
+
+protected:
+	static json::value database;
 };