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/StatusEffect/StatusEffectPrototype.cs

@@ -0,0 +1,23 @@
+using Content.Shared.Alert;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Shared.StatusEffect
+{
+    [Prototype("statusEffect")]
+    public class StatusEffectPrototype : IPrototype
+    {
+        [DataField("id", required: true)]
+        public string ID { get; } = default!;
+
+        [DataField("alert")]
+        public AlertType? Alert { get; }
+
+        /// <summary>
+        ///     Whether a status effect should be able to apply to any entity,
+        ///     regardless of whether it is in ALlowedEffects or not.
+        /// </summary>
+        [DataField("alwaysAllowed")]
+        public bool AlwaysAllowed { get; }
+    }
+}