Seal/abstract/virtual everything (#6739)

Content.Client/Hands/HandButton.cs

@@ -6,7 +6,7 @@ using Robust.Client.UserInterface.Controls;
 
 namespace Content.Client.Hands
 {
-    public class HandButton : ItemSlotButton
+    public sealed class HandButton : ItemSlotButton
     {
         private bool _activeHand;
         private bool _highlighted;

Content.Client/Hands/HandsComponent.cs

@@ -8,7 +8,7 @@ namespace Content.Client.Hands
     [RegisterComponent]
     [ComponentReference(typeof(SharedHandsComponent))]
     [Friend(typeof(HandsSystem))]
-    public class HandsComponent : SharedHandsComponent
+    public sealed class HandsComponent : SharedHandsComponent
     {
         public HandsGui? Gui { get; set; }
     }

Content.Client/Hands/HandsGui.xaml.cs

@@ -202,7 +202,7 @@ namespace Content.Client.Hands
     /// <summary>
     ///     Info on a set of hands to be displayed.
     /// </summary>
-    public class HandsGuiState
+    public sealed class HandsGuiState
     {
         /// <summary>
         ///     The set of hands to be displayed.
@@ -226,7 +226,7 @@ namespace Content.Client.Hands
     /// <summary>
     ///     Info on an individual hand to be displayed.
     /// </summary>
-    public class GuiHand
+    public sealed class GuiHand
     {
         /// <summary>
         ///     The name of this hand.

Content.Client/Hands/HandsVisualizer.cs

@@ -9,7 +9,7 @@ using Robust.Shared.IoC;
 namespace Content.Client.Hands
 {
     [UsedImplicitly]
-    public class HandsVisualizer : AppearanceVisualizer
+    public sealed class HandsVisualizer : AppearanceVisualizer
     {
         public override void OnChangeData(AppearanceComponent component)
         {