Map pool cvar (#12313)

* it just works

* nuke votable

* whoops

Content.Server/Maps/GameMapPrototype.MapSelection.cs

@@ -8,12 +8,6 @@ public sealed partial class GameMapPrototype
     [DataField("fallback")]
     public bool Fallback { get; }
 
-    /// <summary>
-    /// Controls if the map can be voted for.
-    /// </summary>
-    [DataField("votable")]
-    public bool Votable { get; } = true;
-
     /// <summary>
     /// Minimum players for the given map.
     /// </summary>