Add credit tab in About box

[evoggy]

Add a credit tab listing contributors in the about box.

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• Bitbucket: https://bitbucket.org/bitcraze/crazyflie-pc-client/issue/77
• Originally Reported By: Marcus Eliasson
• Originally Created At: 2013-10-30T09:05:59.540

[evoggy]

Manually added credits to UI. Closes #77.

→ <>

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Original Comment By: Marcus Eliasson

[evoggy]

This is now manually added to the UI and will be generated and automatically picked up when #98 is implemented.

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Original Comment By: Marcus Eliasson