Encapsulates a network reply within a container which
is inexpensive to copy and safe to pass around between threads.
The default Qt QNetworkReply class is a QObject, which prevents
it from being copied and passed between threads. This class
grabs all the useful information from a QNetworkReply,
allowing the reply's content to be stored indefinetly without
concern for the lifetime of the QNetworkReply object itself.
