… Tried but failed to fix the cursor blinking issue. For whatever reason it only has a problem when compiled with g++ on the command line, but not with LLVM or LLVM GCC in Xcode, which makes me think it might be some undefined-behavior code I've written somewhere. I need to look into it!

But anyway, for now I just turned off the blinking! haha.
Renamed Error_t to Exception_t and deleted GUIErrorHandling_old.h.