refactor: quantity_io added

example/alternative_namespaces/box_example.cpp

@@ -1,4 +1,5 @@
 
+#include <units/quantity_io.h>
 #include "./length.h"
 #include "./acceleration.h"
 #include "./density.h"

example/alternative_namespaces/capacitor_time_curve.cpp

@@ -24,6 +24,7 @@
 #include <units/physical/si/derived/resistance.h>
 #include <units/physical/si/base/time.h>
 #include <units/math.h>
+#include <units/quantity_io.h>
 #include "./voltage.h"
 #include <iostream>
 

example/alternative_namespaces/clcpp_response.cpp

@@ -17,6 +17,7 @@
 
 #include <iostream>
 #include <units/format.h>
+#include <units/quantity_io.h>
 
 #include "./length.h"
 #include "./volume.h"

example/alternative_namespaces/conversion_factor.cpp

@@ -18,6 +18,7 @@
 
 #include "./units_str.h"
 #include "./length.h"
+#include <units/quantity_io.h>
 #include <iostream>
 
 /*

example/alternative_namespaces/timer.cpp

@@ -1,4 +1,5 @@
 
+#include <units/quantity_io.h>
 #include <iostream>
 #include "./timer.h"