Wieldable/two-handed weapons (#4554)

* wielding kinda works

* rough out all the edges, wielding works nicely

* popups + loc

* increase damage & extra damage against whitelist

* small fixes

* forgot to actually do that

* reviews

* reviews + thing

* use resistances and not extradamageagainstwhitelist

* slashy

* make increasedamageonwield and melee hit events work with modifiersets

* Silly individual

Content.Shared/Hands/Components/HandVirtualItemComponent.cs

@@ -0,0 +1,53 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+using Robust.Shared.Players;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Hands.Components
+{
+    [RegisterComponent]
+    [NetworkedComponent]
+    public sealed class HandVirtualItemComponent : Component
+    {
+        private EntityUid _blockingEntity;
+        public override string Name => "HandVirtualItem";
+
+        /// <summary>
+        ///     The entity blocking this hand.
+        /// </summary>
+        public EntityUid BlockingEntity
+        {
+            get => _blockingEntity;
+            set
+            {
+                _blockingEntity = value;
+                Dirty();
+            }
+        }
+
+        public override ComponentState GetComponentState(ICommonSession player)
+        {
+            return new VirtualItemComponentState(BlockingEntity);
+        }
+
+        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
+        {
+            if (curState is not VirtualItemComponentState pullState)
+                return;
+
+            _blockingEntity = pullState.BlockingEntity;
+        }
+
+        [Serializable, NetSerializable]
+        public sealed class VirtualItemComponentState : ComponentState
+        {
+            public readonly EntityUid BlockingEntity;
+
+            public VirtualItemComponentState(EntityUid blockingEntity)
+            {
+                BlockingEntity = blockingEntity;
+            }
+        }
+    }
+}