Add antagonist OOC - #6368

About the PR

This pull request adds an OOC channel for antagonists within a round to plan a gimmick OOC.

Why / Balance

This PR is basically predicated on the idea that to get something from people, you gotta give them a little trust.
If we want antagonists to plan gimmicks for the benefit of other players within a round, then we need to give them the tools to do that.
The ideal scenario for this PR is that instead of planning gimmicks in advance on Discord, antagonists have time within the round within the actual set of antagonists to figure something out.
I'd love to see stuff like:

(ANTAG): Gaymer: hey does anyone wanna do a cool hostage situation this round idk what to do my objectives are easy
(ANTAG): DeltaEnjoyer: yeah that sounds cool

This also allows antagonists to ask other antagonists (or admins) for help on game mechanics or strategy advice like:

(ANTAG): Gaymer: oh my god how the fuck do you set up a bomb trap
(ANTAG): DeltaEnjoyer: use a multitool

Simply put, this PR gives antagonist the tools to better plan out gimmicks OOC and gives them more ability to ask for help from other antagonists with the hope that this will improve their ability to put on a good performance for other players.
Also, antagonist OOC is global because I believe that even if antagonists are IC in different factions, both are still serving the same goal—put on a good performance for other players.

What is explicitly NOT invited is ick ock

(ANTAG): Gaymernt: ugh shitsec is brigging me anyone wanna break me out

Thankfully, this is surfaced to administrators with the same tools for managing abuse as other OOC channels.

Technical details

• antag OOC is gated by roletype not by a component on a mindrole
• basically just do OOC again but for antagonists

Media

Requirements

• I have tested all added content and changes.
• I have added media to this PR or it does not require an in-game showcase.

Licensing

• I confirm that I am the creator of the code in this PR, and allow licensing it under the following license(s), or that the original author(s) has given me permission to do so:
  • AGPL (https://github.com/DeltaV-Station/Delta-v/blob/master/LICENSE-AGPLv3.txt)
  • MIT (https://github.com/DeltaV-Station/Delta-v/blob/master/LICENSE-MIT.txt)

Changelog

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• add: Antagonists now have access to an OOC channel for planning the round's gimmicks with other antagonists, and asking for help about antagonist mechanics.