Re-organize all projects (#4166)

Content.Server/Radio/EntitySystems/RadioSystem.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using System.Linq;
+using Content.Server.Radio.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Radio.EntitySystems
+{
+    [UsedImplicitly]
+    public class RadioSystem : EntitySystem
+    {
+        private readonly List<string> _messages = new();
+
+        public void SpreadMessage(IRadio source, IEntity speaker, string message, int channel)
+        {
+            if (_messages.Contains(message)) return;
+
+            _messages.Add(message);
+
+            foreach (var radio in ComponentManager.EntityQuery<IRadio>(true))
+            {
+                if (radio.Channels.Contains(channel))
+                {
+                    //TODO: once voice identity gets added, pass into receiver via source.GetSpeakerVoice()
+                    radio.Receive(message, channel, speaker);
+                }
+            }
+
+            _messages.Remove(message);
+        }
+    }
+}