Implement separate window for lyrics

[eloydegen]

I'm not yet sure what what is the best standard to implement, if not both:

• https://en.wikipedia.org/wiki/LRC_(file_format): in a separate file with the same name
• https://id3.org/Lyrics3v2: embedding the lyrics in a metadata tag of the song file

WinAmp example plugin that implemented both specifications: https://winampheritage.com/plugin/lyricsshow/60706

[0x5066]

That's going into territory of what 3rd party plugins added, rather than something that baseline Winamp did.
I'm not sure if this'll be added any time soon...