C++ Bindings Tweak

[Gearoid Murphy <gearoid.murphy@xxxxxx>]

Hi,

I really like the C++ bindings for LibSSH but it's a little unfortunate 
that the acceptForward function is defined externally to the class 
definition, this causes linking errors when the LibSSH C++ header file 
is included in multiple C++ source files.

I've tweaked the C++ bindings slightly so this problem is eliminated. 
The only significant changes to the API are the constructors for the 
Channel and SshException classes. I would argue that these changes are 
inconsequential because the Channel objects are generated via the 
Session class, so there's little impact on end users. In addition, the 
SshException constructor is populated via a preprocessor def which 
again, has little impact on end users.

Of course, it's probable that I'm not anticipated all angles with these 
changes so I'd appreciate feedback, the modified C++ header file is 
attached.

Best Regards
 - Gearoid

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