* adjusted media buffer a bit to mitigate possible YT media hiccups at higher speed
* ensure to cancel previous data source preparation when new request is launched
* in PlayerDetailed screen
	* fixed the defunct force-video button on the top bar (assembling video stream may take a couple seconds)
	* amended audio-only button on the top video bar (removing video stream and resetting audio stream)
* added media title natural sorting algorithm, applied in FeedDetails and Queues screens
