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/Mind/Mind.cs

@@ -259,9 +259,7 @@ namespace Content.Server.Mind
 
         public bool HasRole<T>() where T : Role
         {
-            var t = typeof(T);
-
-            return _roles.Any(role => role.GetType() == t);
+            return _roles.Any(role => role is T);
         }
 
         /// <summary>