Actions System + UI (#2710)

Co-authored-by: Vera Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>

Content.Shared/Alert/IAlertClick.cs

@@ -0,0 +1,37 @@
+using System;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.Serialization;
+
+namespace Content.Shared.Alert
+{
+    /// <summary>
+    /// Defines what should happen when an alert is clicked.
+    /// </summary>
+    public interface IAlertClick : IExposeData
+    {
+
+        /// <summary>
+        /// Invoked on server side when user clicks an alert.
+        /// </summary>
+        /// <param name="args"></param>
+        void AlertClicked(ClickAlertEventArgs args);
+    }
+
+    public class ClickAlertEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Player clicking the alert
+        /// </summary>
+        public readonly IEntity Player;
+        /// <summary>
+        /// Alert that was clicked
+        /// </summary>
+        public readonly AlertPrototype Alert;
+
+        public ClickAlertEventArgs(IEntity player, AlertPrototype alert)
+        {
+            Player = player;
+            Alert = alert;
+        }
+    }
+}