added listModel case, and RenderListModels method to render List models for those models used by methods that returns a list
added listModel case, and RenderListModels method to render List models for those models used by methods that returns a list

avadev/AvaTaxClientLibrary,avadev/AvaTaxClientLibrary,avadev/AvaTaxClientLibrary,avadev/AvaTaxClientLibrary,avadev/AvaTaxClientLibrary,avadev/AvaTaxClientLibrary