Adds movement stress test component.

It moves a lot to stress test moving things.

Content.Server/GameObjects/Components/StressTestMovementComponent.cs

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+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+
+namespace Content.Server.GameObjects.Components
+{
+    [RegisterComponent]
+    public class StressTestMovementComponent : Component
+    {
+        public override string Name => "StressTestMovement";
+
+        public float Progress { get; set; }
+        public Vector2 Origin { get; set; }
+
+        protected override void Startup()
+        {
+            base.Startup();
+
+            Origin = Owner.Transform.WorldPosition;
+        }
+    }
+}

Content.Server/GameObjects/EntitySystems/StressTestMovementSystem.cs

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+using System;
+using Content.Server.GameObjects.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Maths;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class StressTestMovementSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            EntityQuery = new TypeEntityQuery<StressTestMovementComponent>();
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            foreach (var entity in RelevantEntities)
+            {
+                var stressTest = entity.GetComponent<StressTestMovementComponent>();
+                var transform = entity.Transform;
+
+                stressTest.Progress += frameTime;
+
+                if (stressTest.Progress > 1)
+                {
+                    stressTest.Progress -= 1;
+                }
+
+                var x = MathF.Sin(stressTest.Progress * MathHelper.TwoPi);
+                var y = MathF.Cos(stressTest.Progress * MathHelper.TwoPi);
+
+                transform.WorldPosition = stressTest.Origin + (new Vector2(x, y) * 5);
+            }
+        }
+    }
+}

Resources/Prototypes/Entities/stressTest.yml

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+- type: entity
+  id: StressTest
+  name: StressTest
+  components:
+  - type: Sprite
+    texture: Effects/explosion.png
+  - type: StressTestMovement