6 LaTeX newcommands, usepackages etc.
You can add these in the header-includes part of the code at the start of this file. You cannot pass a filename to this at the moment. If this is a dealbreaker then let me know. This will work in all formats. All other ways of adding commands and packages in will not result in the right thing happening in formats other than PDF, as far as I know. \[ BOO(x) \]