Remove all using directives for STL namespace and members

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

modules/highgui/test/test_drawing.cpp

@@ -43,6 +43,7 @@
 #include "test_precomp.hpp"
 #include "opencv2/highgui/highgui.hpp"
 
+using namespace std;
 using namespace cv;
 
 //#define DRAW_TEST_IMAGE