Add YouTube playlist downloader with configuration support

- Implemented a new script (yt-playlist-main.py) for downloading audio from YouTube playlists.
- Added configuration file (yt-playlist-config.json) to specify playlists, save paths, and binary paths.
- Integrated error handling and validation for required binaries (yt-dlp, ffmpeg, aria2c).
- Included functionality to update yt-dlp automatically.
- Added support for parallel downloads and cleanup of removed tracks.
- Implemented renumbering of downloaded tracks based on playlist order.

yt-playlist-config.json

@@ -0,0 +1,14 @@
+{
+  "playlists": [
+    {
+      "url": "https://www.youtube.com/playlist?list=PLUmRr21IDW9VOlWwIcr1Foyj2pMh-Jvpb",
+      "save_path": "R:/localtracks/darkzoul",
+      "archive": "archive.txt"
+    }
+  ],
+  "yt_dlp_path": "yt-dlp.exe",
+  "ffmpeg_path": "ffmpeg.exe",
+  "aria2c_path": "aria2c.exe",
+  "max_parallel_downloads": 10,
+  "aria2c_connections": 8
+}