ToDo: forward UA/referrer from yt-dlp output to LAV Splitter

[clsid2]

LAV Splitter Source has new interface to open URL with these parameters: https://github.com/Nevcairiel/LAVFilters/blob/master/include/IURLSourceFilterLAV.h

• Check if yt-dlp output contains UA or referrer data
• Add function to graph builder to set that data
• Check if LAV supports the interface (could also be done based on version)
• Call the new LoadURL function instead of using generic instance of the source filter (if UA/referrer non-empty)