Adds working communications console that ends the round

Content.Server/GameObjects/EntitySystems/RoundEndSystem.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Threading;
+using Content.Server.Interfaces.GameTicking;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.IoC;
+using Timer = Robust.Shared.Timers.Timer;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    public class RoundEndSystem : EntitySystem
+    {
+#pragma warning disable 649
+        [Dependency] private IGameTicker _gameTicker;
+#pragma warning restore 649
+
+        private CancellationTokenSource _roundEndCancellationTokenSource = new CancellationTokenSource();
+        public bool IsRoundEndCountdownStarted { get; private set; }
+        public int RoundEndCountdownTime { get; set; } = 5000;
+        public DateTime? ExpectedCountdownEnd = null;
+
+        public delegate void RoundEndCountdownStarted();
+        public event RoundEndCountdownStarted OnRoundEndCountdownStarted;
+
+        public delegate void RoundEndCountdownCancelled();
+        public event RoundEndCountdownCancelled OnRoundEndCountdownCancelled;
+
+        public delegate void RoundEndCountdownFinished();
+        public event RoundEndCountdownFinished OnRoundEndCountdownFinished;
+
+        public void RequestRoundEnd()
+        {
+            if (IsRoundEndCountdownStarted)
+                return;
+
+            IsRoundEndCountdownStarted = true;
+
+            ExpectedCountdownEnd = DateTime.Now.AddMilliseconds(RoundEndCountdownTime);
+            Timer.Spawn(RoundEndCountdownTime, EndRound, _roundEndCancellationTokenSource.Token);
+            OnRoundEndCountdownStarted?.Invoke();
+        }
+
+        public void CancelRoundEndCountdown()
+        {
+            _roundEndCancellationTokenSource.Cancel();
+            _roundEndCancellationTokenSource = new CancellationTokenSource();
+
+            ExpectedCountdownEnd = null;
+
+            OnRoundEndCountdownCancelled?.Invoke();
+        }
+
+        private void EndRound()
+        {
+            OnRoundEndCountdownFinished?.Invoke();
+            _gameTicker.EndRound();
+        }
+    }
+}