Create Tdarr_Plugin_advo_FFMPEG_NVENC_Tiered_MKV_with_rollback.js

[cjmanca]

Video transcode plugin (FFMPEG NVENC h265)

• Post transcode size filter, but instead of cancelling stack, will rollback to original video to allow other audio/subtitle plugins to execute. Recommended to place this as the first plugin, so the size filter will only check the video stream size difference.
• Will detect HDR and tonemap to SDR.
• Uses different FFMPEG NVENC transcoding settings for 480p,576p,720p,1080p and 4KUHD.
• 10 bit output.
• The output container is mkv. Converts or strips streams which mkv doesn't support.
• bFrame support.