Seal/abstract/virtual everything (#6739)

Content.Shared/Roles/AntagPrototype.cs

@@ -8,7 +8,7 @@ namespace Content.Shared.Roles
     ///     Describes information for a single antag.
     /// </summary>
     [Prototype("antag")]
-    public class AntagPrototype : IPrototype
+    public sealed class AntagPrototype : IPrototype
     {
         [ViewVariables]
         [DataField("id", required: true)]

Content.Shared/Roles/JobPrototype.cs

@@ -13,7 +13,7 @@ namespace Content.Shared.Roles
     ///     Describes information for a single job on the station.
     /// </summary>
     [Prototype("job")]
-    public class JobPrototype : IPrototype
+    public sealed class JobPrototype : IPrototype
     {
         private string _name = string.Empty;
 

Content.Shared/Roles/StartingGearPrototype.cs

@@ -8,7 +8,7 @@ using Robust.Shared.ViewVariables;
 namespace Content.Shared.Roles
 {
     [Prototype("startingGear")]
-    public class StartingGearPrototype : IPrototype
+    public sealed class StartingGearPrototype : IPrototype
     {
         // TODO: Custom TypeSerializer for dictionary value prototype IDs
         [DataField("equipment")] private Dictionary<string, string> _equipment = new();