message: generator: Switch #[macro_use] to `use` and exclude `nom::dbg`
  This avoids an obnoxious error when attemting to use `dbg!()` while
  debugging the generator.
  Unfortunately there seems to be no way to import * except `dbg`, or
  shadow `dbg` (using eg. `use nom::{dbg as _nom_dbg, *};`).
diff: #![recursion_limit = "256"]
  -#[macro_use]
  -extern crate nom;
  -#[macro_use]
  -extern crate quote;
  -pub use vk_parse;
  -pub use vkxml;
  +use nom::{alt, char, do_parse, map, named, opt, tag, take_while1, terminated};
  +use quote::*;
  use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
  use itertools::Itertools;
  