Macro kittycad_modeling_cmds::impl_extern_type

macro_rules! impl_extern_type {
    ($([$kind:ident] $($(#[$($attr:tt)*])* $ty:path = $cxxpath:literal)*)*) => { ... };
}

This tells the c++ interop what the native c++ names are from https://docs.rs/cxx/latest/src/cxx/extern_type.rs.html