Add additional metadata to .lrc files

[UnviableFriend]

The .lrc format supports various metadata fields which could be used to enhance lyriks.

https://en.wikipedia.org/wiki/.lrc

Tag type	Tag purpose
ti	Title of the song
ar	Artist performing the song
al	Album the song is from
au	Author of the song
lr	Lyricist of the song
length	Length of the song (mm:ss)
by	Author of the LRC file (not the song)
offset	Specifies a global offset value for the lyric times, in milliseconds. The value is prefixed with either + or -, with + causing lyrics to appear sooner
re/tool	The player or editor that created the LRC file
ve	The version of the program
#	Comments

For example the source (Genie) could be added, then in the future if there is a better source the tool can see where each came from and upgrade them.

[Maxr1998]

Great idea! I'll look into implementing this soon. Might require some code restructuring to have the necessary metadata available in the lyrics object. But is certainly possible to support.