Shitty combat mode & animations. (#367)

* Combat mode UI & targeting zones.

* Fix inventory hud positioning.

* Crappy attack animations.

* Import TG combat sounds

* More work on arcs.

* Implement hit sounds.

* Lunging, hit effects, some more stuff.

Content.Client/GameObjects/Components/Mobs/MeleeLungeComponent.cs

@@ -0,0 +1,65 @@
+using Robust.Client.GameObjects;
+using Robust.Client.Interfaces.GameObjects.Components;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+
+namespace Content.Client.GameObjects.Components.Mobs
+{
+    [RegisterComponent]
+    public sealed class MeleeLungeComponent : Component
+    {
+        public override string Name => "MeleeLunge";
+
+        private const float ResetTime = 0.3f;
+        private const float BaseOffset = 0.25f;
+
+        private Angle _angle;
+        private float _time;
+
+        public void SetData(Angle angle)
+        {
+            _angle = angle;
+            _time = 0;
+        }
+
+        public void Update(float frameTime)
+        {
+            _time += frameTime;
+
+            var offset = Vector2.Zero;
+            var deleteSelf = false;
+
+            if (_time > ResetTime)
+            {
+                deleteSelf = true;
+            }
+            else
+            {
+                offset = _angle.RotateVec((BaseOffset, 0));
+                offset *= (ResetTime - _time) / ResetTime;
+            }
+
+            if (Owner.TryGetComponent(out CameraRecoilComponent recoilComponent))
+            {
+                recoilComponent.BaseOffset = offset;
+            }
+            else if (Owner.TryGetComponent(out EyeComponent eyeComponent))
+            {
+                eyeComponent.Offset = offset;
+            }
+
+            if (Owner.TryGetComponent(out ISpriteComponent spriteComponent))
+            {
+                // We have to account for rotation so the offset still checks out.
+                // SpriteComponent.Offset is applied before transform rotation (as expected).
+                var worldRotation = Owner.Transform.WorldRotation;
+                spriteComponent.Offset = new Angle(-worldRotation).RotateVec(offset);
+            }
+
+            if (deleteSelf)
+            {
+                Owner.RemoveComponent<MeleeLungeComponent>();
+            }
+        }
+    }
+}