Improve CrtpShark toolbox

[evoggy]

Add timestamps, direction and fix current bugs. Also add the functionality to save data to file.

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• Bitbucket: https://bitbucket.org/bitcraze/crazyflie-pc-client/issue/105
• Originally Reported By: Marcus Eliasson
• Originally Created At: 2014-01-24T14:59:57.123

[evoggy]

Improvements to CrtpShark toolbox. Closes #105.

→ <<cset 7fa0fe57b12d>>

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Original Comment By: Marcus Eliasson