Click Drag Functionality + Refactor Interaction Interfaces (#1125)

Co-authored-by: Víctor Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>
Co-authored-by: ComicIronic <comicironic@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Server/Interfaces/GameObjects/Components/Interaction/IAttack.cs

@@ -0,0 +1,26 @@
+using System;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Map;
+
+namespace Content.Server.Interfaces.GameObjects.Components.Interaction
+{
+    /// <summary>
+    ///     This interface gives components behavior when being used to "attack".
+    /// </summary>
+    public interface IAttack
+    {
+        void Attack(AttackEventArgs eventArgs);
+    }
+
+    public class AttackEventArgs : EventArgs
+    {
+        public AttackEventArgs(IEntity user, GridCoordinates clickLocation)
+        {
+            User = user;
+            ClickLocation = clickLocation;
+        }
+
+        public IEntity User { get; }
+        public GridCoordinates ClickLocation { get; }
+    }
+}