Merge pull request #25042 from mshabunin:doc-upgrade

Documentation transition to fresh Doxygen #25042

* current Doxygen version is 1.10, but we will use 1.9.8 for now due to issue with snippets (https://github.com/doxygen/doxygen/pull/10584)
* Doxyfile adapted to new version
* MathJax updated to 3.x
* `@relates` instructions removed temporarily due to issue in Doxygen (to avoid warnings)
* refactored matx.hpp - extracted matx.inl.hpp
* opencv_contrib - https://github.com/opencv/opencv_contrib/pull/3638

modules/imgcodecs/include/opencv2/imgcodecs.hpp

@@ -48,7 +48,6 @@
 /**
   @defgroup imgcodecs Image file reading and writing
   @{
-    @defgroup imgcodecs_c C API
     @defgroup imgcodecs_flags Flags used for image file reading and writing
     @defgroup imgcodecs_ios iOS glue
     @defgroup imgcodecs_macosx MacOS(OSX) glue
@@ -297,7 +296,7 @@ It also demonstrates how to save multiple images in a TIFF file:
 CV_EXPORTS_W bool imwrite( const String& filename, InputArray img,
               const std::vector<int>& params = std::vector<int>());
 
-/// @overload multi-image overload for bindings
+//! @brief multi-image overload for bindings
 CV_WRAP static inline
 bool imwritemulti(const String& filename, InputArrayOfArrays img,
                   const std::vector<int>& params = std::vector<int>())