1) Reworked FFmpeg and FFprobe path discovery (CLI switch, Custom xml, system $PATH, UI update trigger). Removed FFMpeg folder from Emby.Server.Implementations. All path discovery now in MediaEncoder.
2) Always display FFmpeg path to user in Transcode page.
3) Allow user to remove a Custome FFmpeg path and return to using system $PATH (or --ffmpeg if available).
4) Remove unused code associated with 'prebuilt' FFmpeg.
5) Much improved logging during path discovery.
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