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/detection_based_tracker_sample.cpp

@@ -116,7 +116,7 @@ static int test_FaceDetector(int argc, char *argv[])
         LOGD("\n\nSTEP n=%d        from prev step %f ms\n\n", n, t_ms);
         m=images[n-1];
         CV_Assert(! m.empty());
-        cvtColor(m, gray, CV_BGR2GRAY);
+        cvtColor(m, gray, COLOR_BGR2GRAY);
 
         fd.process(gray);