ERT Loadout Improvements

[Nox38]

About the PR

Modernized the starting equipment of ERT operatives with the general goal of not requiring admins to spawn in additional equipment for them to be effective at their jobs. Also adds a few variants of the ERT security for different squad roles, and arms all operatives with mk58s so they can defend themselves.

Why / Balance

NT Operatives have lots of storage, but not much to fill it. They generally have to scavenge station equipment after arriving, which doesn't make much sense for NT's finest.

Technical details

Added new loadouts and changed the old ones in emergencyresponseteam.yml.

Media

To be added

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an ingame showcase.

Breaking changes

Renamed multiple ERT job/loadout IDs.

Changelog

🆑 Nox38

• Tweak: All ERT previously unarmed operatives get a Mk58 Pistol.
• Tweak: ERT bags now provide explosion resistance to content, and have a 10% sprint penalty.
• Tweak: Consolidated the "Armored EVA" and "Enviro EVA" tags into "EVA".
• Add: Longarm-equipped ERT members are now classified as 'ERT Marines' with several different roles/guns, including the leader, medic, rifleman, breacher, and grenadier.