Added search functionality and created a new icon for the My Queue and History items.
Added handling for zero or null returns. A message dialog will popup informing the users that no results were returned. This applies to all functions and areas of the code. All refrences to the outdated MessageContainer dialog box were removed and replaced with an ObjectContainer using the header & message kwargs.
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Changed the preference label for Quality to Video Quality to clarify its purpose.
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Changed service code to handle config_urls that have 0 in the video_quality field.
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