Dynamic-block states are read but not inserted into States list

[mme1950]

The States list of the BlockVisibilityParameter object is not filled.

Suggestion (CadBlockVisibilityParameterTemplate):

	public override void Build(CadDocumentBuilder builder)
	{
		base.Build(builder);

		BlockVisibilityParameter bvp = this.CadObject as BlockVisibilityParameter;

		foreach (var handle in this.EntityHandles)
		{
			if (builder.TryGetCadObject(handle, out Entity entity))
			{
				bvp.Entities.Add(entity);
			}
			else
			{
				builder.Notify($"[{bvp.ToString()}] entity with handle {handle} not found.");
			}
		}

		foreach (var item in StateTemplates)
		{
			item.Build(builder, this.EntityHandles);
			bvp.States.Add(item.State);
		}
	}