Client ConnectWithContext now includes a buffered channel size setting

[daninmadison]

If the size is non-zero, a buffered channel for MsgConnected messages will be created. The caller receives a reference to the buffered channel (non-nil indicates a buffered channel was created). When the Client connects, it will send a MsgConnected message (true) on the buffered channel. If the Client disconnects, it will send a MsgConnected message (false) on the buffered channel. The caller is responsible for retrieving the buffered channel messages.# Please enter the commit message for your changes. Lines starting

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This change is