/// The only time the pointer to the `TF_*` structures from section 1 is not
/// marked `const` in these functions is when these function are either
/// allocating or deallocating the plugin specific data. That is, in the 4
/// `cleanup` functions (one for each data structure), the `init` function for
/// `TF_Filesystem` and the `new_*` methods of `TF_FilesystemOps` to initialize
/// the 3 types of files. In all other cases, there is no need to modify the