Actions System + UI (#2710)

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

Content.Shared/GameObjects/EntitySystems/SharedActionSystem.cs

@@ -0,0 +1,30 @@
+using Content.Shared.GameObjects.Components.Mobs;
+using Content.Shared.Interfaces.GameObjects.Components;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Shared.GameObjects.EntitySystems
+{
+    /// <summary>
+    /// Evicts action states with expired cooldowns.
+    /// </summary>
+    public class SharedActionSystem : EntitySystem
+    {
+        private const float CooldownCheckIntervalSeconds = 10;
+        private float _timeSinceCooldownCheck;
+
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            _timeSinceCooldownCheck += frameTime;
+            if (_timeSinceCooldownCheck < CooldownCheckIntervalSeconds) return;
+
+            foreach (var comp in ComponentManager.EntityQuery<SharedActionsComponent>(false))
+            {
+                comp.ExpireCooldowns();
+            }
+            _timeSinceCooldownCheck -= CooldownCheckIntervalSeconds;
+        }
+    }
+}