Return .CSPROJ file to correct

Path for compilation was incorrect.
Added TradePile and Watchlist remove requests

Added ability to remove items from both TradePile and WatchList.

Called as follows:
var tradePileRequest = new TradePileRequest();
await tradePileRequest.RemoveFromTradePile(TradeId)

and

var watchlistRequest = new WatchlistRequest();
await watchlistRequest.RemoveItemsFromWatchlist(list<TradeIds>);