add sim.takeSnapshot lua function

src/lua/LuaScriptInterface.cpp

@@ -765,6 +765,7 @@ void LuaScriptInterface::initSimulationAPI()
 		{"neighbors", simulation_neighbours},
 		{"framerender", simulation_framerender},
 		{"gspeed", simulation_gspeed},
+		{"takeSnapshot", simulation_takeSnapshot},
 		{NULL, NULL}
 	};
 	luaL_register(l, "simulation", simulationAPIMethods);
@@ -2143,6 +2144,12 @@ int LuaScriptInterface::simulation_gspeed(lua_State * l)
 	return 0;
 }
 
+int LuaScriptInterface::simulation_takeSnapshot(lua_State * l)
+{
+	luacon_controller->HistorySnapshot();
+	return 0;
+}
+
 //// Begin Renderer API
 
 void LuaScriptInterface::initRendererAPI()

src/lua/LuaScriptInterface.h

@@ -108,6 +108,7 @@ class LuaScriptInterface: public CommandInterface
 	static int simulation_neighbours(lua_State * l);
 	static int simulation_framerender(lua_State * l);
 	static int simulation_gspeed(lua_State * l);
+	static int simulation_takeSnapshot(lua_State *l);
 
 	//Renderer
 	void initRendererAPI();