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/EntitySystems/MeleeWeaponSystem.cs

@@ -0,0 +1,101 @@
+using System.Linq;
+using Content.Client.GameObjects.Components.Mobs;
+using Content.Client.GameObjects.Components.Weapons.Melee;
+using Content.Shared.GameObjects.Components.Weapons.Melee;
+using JetBrains.Annotations;
+using Robust.Client.Interfaces.GameObjects.Components;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Interfaces.Network;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Maths;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Timers;
+using static Content.Shared.GameObjects.EntitySystemMessages.MeleeWeaponSystemMessages;
+
+namespace Content.Client.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public sealed class MeleeWeaponSystem : EntitySystem
+    {
+#pragma warning disable 649
+        [Dependency] private readonly IPrototypeManager _prototypeManager;
+#pragma warning restore 649
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            EntityQuery = new TypeEntityQuery(typeof(MeleeWeaponArcAnimationComponent));
+        }
+
+        public override void RegisterMessageTypes()
+        {
+            base.RegisterMessageTypes();
+
+            RegisterMessageType<PlayMeleeWeaponAnimationMessage>();
+        }
+
+        public override void HandleNetMessage(INetChannel channel, EntitySystemMessage message)
+        {
+            base.HandleNetMessage(channel, message);
+
+            switch (message)
+            {
+                case PlayMeleeWeaponAnimationMessage playMsg:
+                    PlayWeaponArc(playMsg);
+                    break;
+            }
+        }
+
+        public override void FrameUpdate(float frameTime)
+        {
+            base.FrameUpdate(frameTime);
+
+            foreach (var entity in RelevantEntities)
+            {
+                entity.GetComponent<MeleeWeaponArcAnimationComponent>().Update(frameTime);
+            }
+        }
+
+        private void PlayWeaponArc(PlayMeleeWeaponAnimationMessage msg)
+        {
+            if (!_prototypeManager.TryIndex(msg.ArcPrototype, out MeleeWeaponAnimationPrototype weaponArc))
+            {
+                Logger.Error("Tried to play unknown weapon arc prototype '{0}'", msg.ArcPrototype);
+                return;
+            }
+
+            var attacker = EntityManager.GetEntity(msg.Attacker);
+
+            var lunge = attacker.EnsureComponent<MeleeLungeComponent>();
+            lunge.SetData(msg.Angle);
+
+            var entity = EntityManager.SpawnEntityAt("WeaponArc", attacker.Transform.GridPosition);
+            entity.Transform.LocalRotation = msg.Angle;
+
+            var weaponArcAnimation = entity.GetComponent<MeleeWeaponArcAnimationComponent>();
+            weaponArcAnimation.SetData(weaponArc, msg.Angle);
+
+
+            foreach (var hitEntity in msg.Hits.Select(u => EntityManager.GetEntity(u)))
+            {
+                if (!hitEntity.TryGetComponent(out ISpriteComponent sprite)) continue;
+
+                var originalColor = sprite.Color;
+                var newColor = Color.Red * originalColor;
+                sprite.Color = newColor;
+
+                Timer.Spawn(100, () =>
+                {
+                    // Only reset back to the original color if something else didn't change the color in the mean time.
+                    if (sprite.Color == newColor)
+                    {
+                        sprite.Color = originalColor;
+                    }
+                });
+            }
+        }
+    }
+}