Seal/abstract/virtual everything (#6739)

Content.Shared/Follower/Components/FollowedComponent.cs

@@ -8,7 +8,7 @@ namespace Content.Shared.Follower.Components;
 ///     Attached to entities that are currently being followed by a ghost.
 /// </summary>
 [RegisterComponent, Friend(typeof(FollowerSystem))]
-public class FollowedComponent : Component
+public sealed class FollowedComponent : Component
 {
     public HashSet<EntityUid> Following = new();
 }

Content.Shared/Follower/Components/FollowerComponent.cs

@@ -5,7 +5,7 @@ namespace Content.Shared.Follower.Components;
 
 [RegisterComponent]
 [Friend(typeof(FollowerSystem))]
-public class FollowerComponent : Component
+public sealed class FollowerComponent : Component
 {
     public EntityUid Following;
 }

Content.Shared/Follower/FollowerSystem.cs

@@ -9,7 +9,7 @@ using Robust.Shared.Maths;
 
 namespace Content.Shared.Follower;
 
-public class FollowerSystem : EntitySystem
+public sealed class FollowerSystem : EntitySystem
 {
     public override void Initialize()
     {