* Use `python.iter` instead of `pairs` to iterate through `_bridged`
* Use `old_loadfile` instead of `safe_require_with_env` to load scripts
in order to handle unusual file names
* Prevent modules imported by scripts from accessing bridge.lua's
environment
* Fix behaviour of `KoboldWorldInfoEntry_mt._kobold_next(t, k)`
* New `next` implementation now has more safety checks