IListener and IRadio purge (#11980)

Content.Server/Speech/Components/ActiveListenerComponent.cs

@@ -0,0 +1,13 @@
+using Content.Server.Chat.Systems;
+
+namespace Content.Server.Speech.Components;
+
+/// <summary>
+///     This component is used to relay speech events to other systems.
+/// </summary>
+[RegisterComponent]
+public sealed class ActiveListenerComponent : Component
+{
+    [DataField("range")]
+    public float Range = ChatSystem.VoiceRange;
+}