#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/BaseEmitSoundComponent.cs

@@ -0,0 +1,22 @@
+using Content.Shared.Sound;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.Sound.Components
+{
+    /// <summary>
+    /// Base sound emitter which defines most of the data fields.
+    /// Accepts both single sounds and sound collections.
+    /// </summary>
+    public abstract class BaseEmitSoundComponent : Component
+    {
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("sound")]
+        public SoundSpecifier Sound { get; set; } = default!;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("variation")]
+        public float PitchVariation { get; set; } = 0.0f;
+    }
+}