f0f0361254
This converts the public `uiLayoutRowWithHeading` function to an object oriented API (an `uiLayout::row` overloaded version), matching the python API. This reduces the difference between the C++ API with the python version, its also helps while converting code from python to C++ code (or vice-versa), making it almost seamless. Same as the original `uiLayout::row`, this overloaded version also now returns an `uiLayout` reference instead of a pointer. New calls to this method should use references too. Part of: #117604 Pull Request: https://projects.blender.org/blender/blender/pulls/138014