MotD (#13655)

MotD (#13655)

* MOTD

* Message of the Day

* Pretty sure the tests aren't me. Let's check.

* Update Content.Shared/CCVar/CCVars.cs

Co-authored-by: AJCM-git <60196617+AJCM-git@users.noreply.github.com>
* command dependencies and moving MOTD to its own system

* Some doc comments

* Let's try those tests again

* More doc comments, most of the github reviews, and aliases for get-motd and set-motd

* Clear test MOTD

* Localized motd commands and completion hints

* Makes set-motd only show up in the alias command if the player has access to it.

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Co-authored-by: AJCM-git <60196617+AJCM-git@users.noreply.github.com>