`typedef std::pair<std::string, int> CraftId` to make code more readable
Downgrade C++11 code: no `auto`, no for-each loops
Fix indentation (use tabs)
`nullptr` → `NULL`
Forgot to commit this file
Removed unnecessary `#include`
Merge branch 'unique_craft_ids_redux' into craft_kill_credits

* unique_craft_ids_redux:
  Removed unnecessary `#include`
  Forgot to commit this file
  Fix indentation (use tabs) `nullptr` → `NULL`
  `typedef std::pair<std::string, int> CraftId` to make code more readable Downgrade C++11 code: no `auto`, no for-each loops