Seal/abstract/virtual everything (#6739)

Content.Shared/Speech/SharedSpeechComponent.cs

@@ -7,7 +7,7 @@ namespace Content.Shared.Speech
     ///     Component required for entities to be able to speak.
     /// </summary>
     [RegisterComponent]
-    public class SharedSpeechComponent : Component
+    public sealed class SharedSpeechComponent : Component
     {
         [DataField("enabled")]
         private bool _enabled = true;

Content.Shared/Speech/SpeakAttemptEvent.cs

@@ -2,7 +2,7 @@
 
 namespace Content.Shared.Speech
 {
-    public class SpeakAttemptEvent : CancellableEntityEventArgs
+    public sealed class SpeakAttemptEvent : CancellableEntityEventArgs
     {
         public SpeakAttemptEvent(EntityUid uid)
         {

Content.Shared/Speech/SpeechSystem.cs

@@ -2,7 +2,7 @@
 
 namespace Content.Shared.Speech
 {
-    public class SpeechSystem : EntitySystem
+    public sealed class SpeechSystem : EntitySystem
     {
         public override void Initialize()
         {