Refactoring of roles and notifications about antagonist assignment (#16864)

* Refactoring of antagonist roles and notifications about antagonist role assignment.
Refactoring of traitor assignment methods and bug fixing.

* Announcement files moved, code is adjusted to new revision

* Play to entity changed to play to global cause of mono audio restrictions.

* Path to audio files changed to sound specifiers, unique alerts for each role.

* Uncommited changes

* New alert sounds for each antag role.

* PR review fixes

* Antagonist role assignment sound notifications moved to Systems, sounds moved to Components.

* License update

* Fixed naming and redundant parameters

---------

Co-authored-by: Титов Вячеслав Витальевич <rincew1nd@yandex.ru>

Content.Server/GameTicking/Rules/Components/NukeopsRuleComponent.cs

@@ -79,9 +79,6 @@ public sealed class NukeopsRuleComponent : Component
     [DataField("shuttleMap", customTypeSerializer: typeof(ResPathSerializer))]
     public ResPath NukieShuttleMap = new("/Maps/infiltrator.yml");
 
-    [DataField("greetingSound", customTypeSerializer: typeof(SoundSpecifierTypeSerializer))]
-    public SoundSpecifier? GreetSound = new SoundPathSpecifier("/Audio/Misc/nukeops.ogg");
-
     [DataField("winType")]
     public WinType WinType = WinType.Neutral;