Add platform, version, copyright client properties

Add 'platform' 'version', 'copyright' client-properties to start-ok method
during connection handshake.

Adapted from:
https://github.com/synety-jdebp/rabbitmq-c/commit/e3c76e1887ff50378f6146167daa024dbd7d4eeb
by: Jonathan de Boyne Pollard <jonathan.de.boyne.pollard@synety.com>