WiP movement prediction.

Content.Shared/GameObjects/Components/Nutrition/SharedHungerComponent.cs

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+using System;
+using Content.Shared.GameObjects.Components.Movement;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Nutrition
+{
+    public abstract class SharedHungerComponent : Component, IMoveSpeedModifier
+    {
+        public sealed override string Name => "Hunger";
+
+        public sealed override uint? NetID => ContentNetIDs.HUNGER;
+
+        public abstract HungerThreshold CurrentHungerThreshold { get; }
+
+
+        float IMoveSpeedModifier.WalkSpeedModifier
+        {
+            get
+            {
+                if (CurrentHungerThreshold == HungerThreshold.Starving)
+                {
+                    return 0.5f;
+                }
+                return 1.0f;
+            }
+        }
+        float IMoveSpeedModifier.SprintSpeedModifier
+        {
+            get
+            {
+                if (CurrentHungerThreshold == HungerThreshold.Starving)
+                {
+                    return 0.5f;
+                }
+                return 1.0f;
+            }
+        }
+
+        [Serializable, NetSerializable]
+        protected sealed class HungerComponentState : ComponentState
+        {
+            public HungerThreshold CurrentThreshold { get; }
+
+            public HungerComponentState(HungerThreshold currentThreshold) : base(ContentNetIDs.HUNGER)
+            {
+                CurrentThreshold = currentThreshold;
+            }
+        }
+    }
+
+    public enum HungerThreshold : byte
+    {
+        Overfed,
+        Okay,
+        Peckish,
+        Starving,
+        Dead,
+    }
+}