Ambient sound system (#4552)

* Ambient sound system

Client-side system that plays audio from nearby objects that are randomly sampled.

* Decent

* Tweaks

* Tweaks

* Comment this out for now

* reduce VM sound

* Fix rolloff

* Fixes

* Volume tweak

Content.Shared/CCVar/CCVars.cs

@@ -7,6 +7,22 @@ namespace Content.Shared.CCVar
     [CVarDefs]
     public sealed class CCVars : CVars
     {
+        /*
+         * Ambience
+         */
+
+        /// <summary>
+        /// How long we'll wait until re-sampling nearby objects for ambience.
+        /// </summary>
+        public static readonly CVarDef<float> AmbientCooldown =
+            CVarDef.Create("ambience.cooldown", 0.5f, CVar.REPLICATED | CVar.SERVER);
+
+        public static readonly CVarDef<float> AmbientRange =
+            CVarDef.Create("ambience.range", 5f, CVar.REPLICATED | CVar.SERVER);
+
+        public static readonly CVarDef<int> MaxAmbientSources =
+            CVarDef.Create("ambience.max_sounds", 6, CVar.REPLICATED | CVar.SERVER);
+
         /*
          * Status
          */