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/KnockedDownComponent.cs

@@ -0,0 +1,41 @@
+using System;
+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
+{
+    [RegisterComponent]
+    [NetworkedComponent]
+    [Friend(typeof(SharedStunSystem))]
+    public class KnockedDownComponent : Component
+    {
+        public override string Name => "KnockedDown";
+
+        [DataField("helpInterval")]
+        public float HelpInterval { get; set; } = 1f;
+
+        [DataField("helpAttemptSound")]
+        public SoundSpecifier StunAttemptSound = new SoundPathSpecifier("/Audio/Effects/thudswoosh.ogg");
+
+        [ViewVariables]
+        public float HelpTimer { get; set; } = 0f;
+    }
+
+    [Serializable, NetSerializable]
+    public class KnockedDownComponentState : ComponentState
+    {
+        public float HelpInterval { get; set; }
+        public float HelpTimer { get; set; }
+
+        public KnockedDownComponentState(float helpInterval, float helpTimer)
+        {
+            HelpInterval = helpInterval;
+            HelpTimer = helpTimer;
+        }
+    }
+}