Brandlingo questions

Brandlingo answers

• Iterating over std::optional
• OpenCV how to Group Rectangles
• Working directory for google test in Visual Studio
• Python OpenCV cv.WaitKey spits back weird output on Ubuntu modulo 256 maps correctly
• Calling a batch file from another batch file in different directory - resources not found
• Indexing numpy array with another numpy array
• Converting std::__cxx11::string to std::string
• Why not apply [[nodiscard]] to every constructor?
• Google test: assert on equality to one of two values