Status effect refactor (#4868)

* Oops! All Changes In One Commit

* try desperately to fix prediction issues and fail

* oops

* test

* actually fixes prediction issues

* port jittering to status effect

* default merge behavior + alert cooldown stuff

* silly test issue

* zabloing

* address reviews

Content.Shared/Stunnable/StunnedComponent.cs

@@ -0,0 +1,19 @@
+using System;
+using Content.Shared.Movement.Components;
+using Content.Shared.Sound;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Shared.Stunnable
+{
+    [Friend(typeof(SharedStunSystem))]
+    [RegisterComponent, NetworkedComponent]
+    public sealed class StunnedComponent : Component
+    {
+        public sealed override string Name => "Stunned";
+    }
+}