## About The Pull Request
This repurposes the redundant `mobtype` var on the ERT datum. Originally
used to store the typepath for what mob the ERT would spawn (which was
unchanged on any of the other datums), it is now null by default and can
be modified in the summon_ert verb menu. If left blank, it will default
to humans, but it can be set to any humanoid species.

## Why It's Good For The Game
As stated previously, mobtype was redundant, as it would either always
spawn humans (human authority would immediately humanize the spawned
mob) or be overridden by the preferences of the player being spawned.
Rather than making it a hardcoded value and deleting the var, I've
elected to repurpose it for further ERT customization.
Moth ERT, Moth ERT, Moth ERT.
## Changelog
🆑 Rhials
admin: You can now choose the humanoid species spawned by an ERT summon
in the summon menu.
/🆑