[DESKTOP] Board/Logger errors silently logged - need to notify user

[will-hart]

Add a logger_error signal and notify with a pop up box...couple with #53 to allow resetting of logger

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• Bitbucket: https://bitbucket.org/willhart/blitz_gui/issue/61
• Originally Reported By: Will Hart
• Originally Created At: 2014-03-09T18:15:42.536

[will-hart]

Display logger errors in UI. Fixes #61

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Original Comment By: Will Hart