Add CVar for random grid offset, disable it by default.

Content.Shared/CCVar/CCVars.cs

@@ -55,6 +55,12 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<string>
             GameMap = CVarDef.Create("game.map", "Maps/saltern.yml", CVar.SERVERONLY);
 
+        /// <summary>
+        ///     Whether a random position offset will be applied to the station on roundstart.
+        /// </summary>
+        public static readonly CVarDef<bool> StationOffset =
+            CVarDef.Create<bool>("game.station_offset", false);
+
         /// <summary>
         /// When the default blueprint is loaded what is the maximum amount it can be offset from 0,0.
         /// </summary>