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>

Resources/Locale/en-US/motd/motd.ftl

@@ -0,0 +1,11 @@
+cmd-motd-desc = Prints or sets the Message Of The Day.
+cmd-motd-help = motd [ message... ]
+cmd-get-motd-desc = Prints the Message Of The Day.
+cmd-get-motd-help = get-motd
+cmd-set-motd-desc = Sets or clears the Message Of The Day.
+cmd-set-motd-help = set-motd [ message... ]
+cmd-set-motd-hint-head = [ message... ]
+cmd-set-motd-hint-cont = [ ...message... ]
+cmd-set-motd-cleared-motd-message = Cleared the Message of the Day.
+cmd-set-motd-set-motd-message = Set the Message Of The Day to "{$motd}".
+motd-wrap-message = Message of the Day: {$motd}