YTM-Downloader_v1.4

[HehehBoiii78]

In my fork of your repository, I made these changes:

1. Renamed all references of "YouTube-DL" to "yt-dlp" in all scripts. This made the code simpler and made the program less confusing to use for a new user as this is what it's widely known as on GitHub now, even though "youtube-dl" was the original name. I've also removed redundant code that wasn't needed after this rename.
2. Edited error messages to make them easier to understand.
3. Added a Help.txt file in almost every folder to add important instructions on how to set up and manage the program.
4. Added links to each redistributable's download page (no need to visit the repository on GitHub).
5. Improved integrity, error handling and logic, especially in Add Music.cmd and Download.cmd.
6. FFmpeg's Windows binaries can be downloaded from either gyan.dev or BtbN on GitHub. The filenames of the binaries from gyan.dev are inconsistent and downloading them is usually slow, while the binaries from BtbN on GitHub have consistent filenames and downloading them is much faster. So I've switched the program to support the GitHub binaries instead.
7. Cleaned up some code.
8. Improved spelling and grammar in Get Info.cmd.
9. Added missing shortcuts and an executable in the repo's code.

I've tested all these changes by setting up the program from scratch, downloading music and can confirm that everything works as expected.

If you approve this PR, please update the README.md file to match these changes.

[Tech-How]

Thanks for your contributions! I also had a version 1.4 I was working on a couple weeks ago that adds robust commenting inside the scripts and adds better video support as well. I'll revisit this before I publish it.