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.Shared/GameObjects/Components/Mobs/SharedCombatModeComponent.cs

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+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Mobs
+{
+    public abstract class SharedCombatModeComponent : Component
+    {
+        public sealed override uint? NetID => ContentNetIDs.COMBATMODE;
+        public override string Name => "CombatMode";
+        public sealed override Type StateType => typeof(CombatModeComponentState);
+
+        [Serializable, NetSerializable]
+        protected sealed class CombatModeComponentState : ComponentState
+        {
+            public bool IsInCombatMode { get; }
+            public TargetingZone TargetingZone { get; }
+
+            public CombatModeComponentState(bool isInCombatMode, TargetingZone targetingZone)
+                : base(ContentNetIDs.COMBATMODE)
+            {
+                IsInCombatMode = isInCombatMode;
+                TargetingZone = targetingZone;
+            }
+        }
+    }
+}

Content.Shared/GameObjects/Components/Mobs/TargetingZone.cs

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+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Mobs
+{
+    /// <summary>
+    ///     Zones the player can target for attacks.
+    /// </summary>
+    [Serializable, NetSerializable]
+    public enum TargetingZone
+    {
+        /// <summary>
+        ///     Torso/arm area.
+        /// </summary>
+        Middle,
+
+        /// <summary>
+        ///     Legs/groin area.
+        /// </summary>
+        Low,
+
+        /// <summary>
+        ///     Go for the head.
+        /// </summary>
+        High
+    }
+}

Content.Shared/GameObjects/Components/Weapons/Melee/MeleeWeaponAnimationPrototype.cs

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+using System;
+using Robust.Shared.Maths;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Shared.GameObjects.Components.Weapons.Melee
+{
+    [Prototype("MeleeWeaponAnimation")]
+    public sealed class MeleeWeaponAnimationPrototype : IPrototype, IIndexedPrototype
+    {
+        private string _state;
+        private string _id;
+        private Vector4 _colorDelta;
+        private Vector4 _color;
+        private TimeSpan _length;
+        private float _speed;
+        private float _width;
+        private WeaponArcType _arcType;
+
+        [ViewVariables] public string ID => _id;
+        [ViewVariables] public string State => _state;
+        [ViewVariables] public TimeSpan Length => _length;
+        [ViewVariables] public float Speed => _speed;
+        [ViewVariables] public Vector4 Color => _color;
+        [ViewVariables] public Vector4 ColorDelta => _colorDelta;
+        [ViewVariables] public WeaponArcType ArcType => _arcType;
+        [ViewVariables] public float Width => _width;
+
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            var serializer = YamlObjectSerializer.NewReader(mapping);
+
+            serializer.DataField(ref _state, "state", null);
+            serializer.DataField(ref _id, "id", null);
+            serializer.DataField(ref _colorDelta, "colorDelta", Vector4.Zero);
+            serializer.DataField(ref _color, "color", new Vector4(1, 1, 1, 1));
+            if (serializer.TryReadDataField("length", out float length))
+            {
+                _length = TimeSpan.FromSeconds(length);
+            }
+            else
+            {
+                _length = TimeSpan.FromSeconds(0.5f);
+            }
+
+            serializer.DataField(ref _speed, "speed", 1);
+            serializer.DataField(ref _arcType, "arcType", WeaponArcType.Slash);
+            serializer.DataField(ref _width, "width", 90);
+        }
+    }
+
+    public enum WeaponArcType
+    {
+        Slash,
+        Poke,
+    }
+}