#4219 emit sound system add single sound support (#4237)

* Revert "#3935 implemented suggestions from PR"

This reverts commit a9b1c7b96333ca570067d6a9df1954481005892a.

* #4219 revert of single sound removal in EmitSoundSystem

* #4219 single sounds in EmitSoundSystem should work now

* #4219 some small project tweaks

* #4219 upgraded EmitSoundSystem to use SoundSpecifier

* #4219 pr tweaks

* #4219 pr tweak

* #4219 missing bike horn .yaml change

Content.Server/Sound/Components/EmitSoundOnActivateComponent.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Sound.Components
+{
+    /// <summary>
+    /// Simple sound emitter that emits sound on ActivateInWorld
+    /// </summary>
+    [RegisterComponent]
+    public class EmitSoundOnActivateComponent : BaseEmitSoundComponent
+    {
+        /// <inheritdoc />
+        public override string Name => "EmitSoundOnActivate";
+    }
+}