Add GhostRadio to allow ghosts to hear radio messages (#4896)

* Add GhostRadio to allow ghosts to hear radio messages

* Add GhostRadio to ignored components

Content.Server/Ghost/Components/GhostRadioComponent.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using Content.Server.Radio.Components;
+using Content.Shared.Chat;
+using Robust.Server.GameObjects;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+using Robust.Shared.Network;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Ghost.Components
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(IRadio))]
+    public class GhostRadioComponent : Component, IRadio
+    {
+        [Dependency] private readonly IServerNetManager _netManager = default!;
+
+        public override string Name => "GhostRadio";
+
+        [DataField("channels")]
+        private List<int> _channels = new(){1459};
+
+        public IReadOnlyList<int> Channels => _channels;
+
+        public void Receive(string message, int channel, IEntity speaker)
+        {
+            if (!Owner.TryGetComponent(out ActorComponent? actor))
+                return;
+
+            var playerChannel = actor.PlayerSession.ConnectedClient;
+
+            var msg = _netManager.CreateNetMessage<MsgChatMessage>();
+
+            msg.Channel = ChatChannel.Radio;
+            msg.Message = message;
+            //Square brackets are added here to avoid issues with escaping
+            msg.MessageWrap = Loc.GetString("chat-radio-message-wrap", ("channel", $"\\[{channel}\\]"), ("name", speaker.Name));
+            _netManager.ServerSendMessage(msg, playerChannel);
+        }
+
+        public void Broadcast(string message, IEntity speaker) { }
+    }
+}