Remove IMoveSpeedModifier in favor of events (#5212)

* Remove IMoveSpeedModifier

* fucking magboots

* yope

* rabiews

Content.Shared/Nutrition/EntitySystems/SharedHungerSystem.cs

@@ -0,0 +1,22 @@
+using Content.Shared.Movement.EntitySystems;
+using Content.Shared.Nutrition.Components;
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Nutrition.EntitySystems
+{
+    public class SharedHungerSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<SharedHungerComponent, RefreshMovementSpeedModifiersEvent>(OnRefreshMovespeed);
+        }
+
+        private void OnRefreshMovespeed(EntityUid uid, SharedHungerComponent component, RefreshMovementSpeedModifiersEvent args)
+        {
+            float mod = component.CurrentHungerThreshold == HungerThreshold.Starving ? 0.75f : 1.0f;
+            args.ModifySpeed(mod, mod);
+        }
+    }
+}