Merge pull request #25075 from mshabunin:cleanup-imgproc-1

C-API cleanup: apps, imgproc_c and some constants #25075

Merge with https://github.com/opencv/opencv_contrib/pull/3642

* Removed obsolete apps - traincascade and createsamples (please use older OpenCV versions if you need them). These apps relied heavily on C-API
* removed all mentions of imgproc C-API headers (imgproc_c.h, types_c.h) - they were empty, included core C-API headers
* replaced usage of several C constants with C++ ones (error codes, norm modes, RNG modes, PCA modes, ...) - most part of this PR (split into two parts - all modules and calib+3d - for easier backporting)
* removed imgproc C-API headers (as separate commit, so that other changes could be backported to 4.x)

Most of these changes can be backported to 4.x.

modules/core/src/matrix_operations.cpp

@@ -965,7 +965,7 @@ void cv::reduce(InputArray _src, OutputArray _dst, int dim, int op, int dtype)
     }
 
     if( !func )
-        CV_Error( CV_StsUnsupportedFormat,
+        CV_Error( cv::Error::StsUnsupportedFormat,
                   "Unsupported combination of input and output array formats" );
 
     func( src, temp );