SocketWrapper - copyable networking clients

[JAndrassy]

copyable networking clients

it is done the same way as in other LwIP based Arduino networking libraries including the C33 LwipWrapper. There WiFiClient/EthernetClient is a simple copyable class redirecting every method to the object managing the socket. That object is stored in std:shared_ptr.
The PR uses the existing MbedClient as the managing class and adds the copyable class from which then WiFiClent and EthernetClient inherit.

I can't test WiFiSSLSE050Client

[megacct]

Great work, I'm back up and running with my telnet server. I did get a crash when doing a client available() or read() (not sure which) after having called a stop() on the client. Easy workaround in my code and probably shouldn't have been doing that anyway.

[JAndrassy]

@facchinm this is important. the networking libraries in this core will not work correctly without this. the copy ability of instanced objects is a feature of the Arduino language. Imagine String would not be copyable in some Core.

[pennam]

@JAndrassy I think you should rebase this on master since setTimeout has been renamed in setSocketTimeout

[JAndrassy]

@pennam thank you for the reminder. done

[pennam]

Thanks for the contribution @JAndrassy

Do you mind also changing setEccSlot visibility? It must be public.

I'm running a bit of testing on this PR so we can hopefully merge it for the next release.

[pennam]

👍 Thanks