Initial convertion of a_Dt to std::chrono

also refactored cWorld::m_WorldAge and cWorld::m_TimeOfDay

src/Bindings/LuaState.cpp

@@ -839,6 +839,13 @@ void cLuaState::Push(void * a_Ptr)
 	m_NumCurrentFunctionArgs += 1;
 }
 
+void cLuaState::Push(std::chrono::milliseconds a_Value)
+{
+	ASSERT(IsValid());
+
+	tolua_pushnumber(m_LuaState, a_Value.count());
+	m_NumCurrentFunctionArgs += 1;
+}