[CORE] TCP/IP client needs to check stop_event whilst `waiting` for responses

[will-hart]

See changes to netscanner class on netscanner feature branch

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• Bitbucket: https://bitbucket.org/willhart/blitz_gui/issue/48
• Originally Reported By: Will Hart
• Originally Created At: 2014-03-07T12:38:28.870

[will-hart]

Check for a stop_event in TCP server loop. Fixes #48

→ <<cset 9445c9778b69>>

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Original Comment By: Will Hart