SSH: Initial setup of TElSSHServer

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TElSSHServer class is a low-level class that acts as a data processor. Sockets (or other transport channel) layer and threading is to be implemented by the separately. A separate instance of TElSSHServer is used for each incoming client connection.

At least the following events should be handled to make TElSSHServer work:

OnOpenConnection is fired when the incoming connection is established
OnSend is used when the class needs to to send outgoing data to the client
OnReceive is used to receive incoming data from the client
OnCloseConnection is fired when the logical connection is closed

Also at least one of the following events should be handled to provide any meaningful functionality to the connected clients:

OnOpenShell is fired when shell subsytem is requested by the client
OnOpenCommand is fired when command subsytem is requested by the client
OnOpenSubsystem is fired when other subsytem is requested by the client

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