Remove IRelayMoveInput (#4663)

* Remove IRelayMoveInput

This interface gets called every time a movement key is pressed so it gets called a lot.

* Remove RelayMovementEntityMessage

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/Body/BodySystem.cs

@@ -0,0 +1,32 @@
+using Content.Server.GameTicking;
+using Content.Server.Mind.Components;
+using Content.Shared.MobState;
+using Content.Shared.MobState.State;
+using Content.Shared.Movement.EntitySystems;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Server.Body
+{
+    public sealed class BodySystem : EntitySystem
+    {
+        [Dependency] private readonly GameTicker _ticker = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<BodyComponent, RelayMoveInputEvent>(OnRelayMoveInput);
+        }
+
+        private void OnRelayMoveInput(EntityUid uid, BodyComponent component, RelayMoveInputEvent args)
+        {
+            if (ComponentManager.TryGetComponent<IMobStateComponent>(uid, out var mobState) &&
+                mobState.IsDead() &&
+                ComponentManager.TryGetComponent<MindComponent>(uid, out var mind) &&
+                mind.HasMind)
+            {
+                _ticker.OnGhostAttempt(mind.Mind!, true);
+            }
+        }
+    }
+}