Applied all fixes related to translating C to C++ code

Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems

samples/cpp/tutorial_code/ImgTrans/CannyDetector_Demo.cpp

@@ -58,10 +58,10 @@ int main( int, char** argv )
   dst.create( src.size(), src.type() );
 
   /// Convert the image to grayscale
-  cvtColor( src, src_gray, CV_BGR2GRAY );
+  cvtColor( src, src_gray, COLOR_BGR2GRAY );
 
   /// Create a window
-  namedWindow( window_name, CV_WINDOW_AUTOSIZE );
+  namedWindow( window_name, WINDOW_AUTOSIZE );
 
   /// Create a Trackbar for user to enter threshold
   createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, CannyThreshold );