Allow ghosts to hear radio message globally (#15078)

Content.Server/Radio/Components/ActiveRadioComponent.cs

@@ -14,4 +14,10 @@ public sealed class ActiveRadioComponent : Component
     /// </summary>
     [DataField("channels", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<RadioChannelPrototype>))]
     public HashSet<string> Channels = new();
+
+    /// <summary>
+    ///     If this radio can hear all messages on all maps
+    /// </summary>
+    [DataField("globalReceive")]
+    public bool GlobalReceive = false;
 }

Content.Server/Radio/EntitySystems/RadioSystem.cs

@@ -90,7 +90,7 @@ public sealed class RadioSystem : EntitySystem
             if (!radio.Channels.Contains(channel.ID))
                 continue;
 
-            if (!channel.LongRange && transform.MapID != sourceMapId)
+            if (!channel.LongRange && transform.MapID != sourceMapId && !radio.GlobalReceive)
                 continue;
 
             // don't need telecom server for long range channels or handheld radios and intercoms

Resources/Prototypes/Entities/Mobs/Player/observer.yml

@@ -41,6 +41,7 @@
     - Service
     - Supply
     - Syndicate
+    globalReceive: true
   - type: Sprite
     overrideContainerOcclusion: true # Ghosts always show up regardless of where they're contained.
     netsync: false