Seal/abstract/virtual everything (#6739)

Content.Server/Salvage/SalvageMagnetComponent.cs

@@ -10,7 +10,7 @@ namespace Content.Server.Salvage
     ///     A salvage magnet.
     /// </summary>
     [RegisterComponent]
-    public class SalvageMagnetComponent : Component
+    public sealed class SalvageMagnetComponent : Component
     {
         /// <summary>
         ///     Offset relative to magnet that salvage should spawn.

Content.Server/Salvage/SalvageMapPrototype.cs

@@ -10,7 +10,7 @@ using Robust.Shared.ViewVariables;
 namespace Content.Server.Salvage
 {
     [Prototype("salvageMap")]
-    public class SalvageMapPrototype : IPrototype
+    public sealed class SalvageMapPrototype : IPrototype
     {
         [ViewVariables]
         [DataField("id", required: true)]

Content.Server/Salvage/SalvageSystem.cs

@@ -24,7 +24,7 @@ using System.Linq;
 
 namespace Content.Server.Salvage
 {
-    public class SalvageSystem : EntitySystem
+    public sealed class SalvageSystem : EntitySystem
     {
         [Dependency] private readonly IChatManager _chatManager = default!;
         [Dependency] private readonly IPauseManager _pauseManager = default!;
@@ -368,7 +368,7 @@ namespace Content.Server.Salvage
         }
     }
 
-    public class SalvageGridState
+    public sealed class SalvageGridState
     {
         public TimeSpan CurrentTime { get; set; }
         public List<SalvageMagnetComponent> ActiveMagnets { get; } = new();