Added ability to add auction item to Watchlist. And ability to send Item to Club

Add item to watchlist:
client.AddToWatchlistRequest(auctionInfo);

Can be used to add any auction item to the Watchlist. The same Watchlist used when making a bid on any item.

Send item to Club:
 var sendToClubResponds = await client.SendItemToClubAsync(auctionInfo.ItemData);

Can be used to remove items from Tradepile to make space for other items