Implement lyric can reference by other lyric. #1444

For some cases, some of the lyric in the karaoke song are almost same as other lyrics, the difference between those lyrics are the offset time.
So we can add property like ReferenceLyric to mark the lyric is referenced by other lyrics.

Also, because some of the property is not need to be referenced, so we can make the enums to decide which properties should be referenced:

• Lyric (will sync the lyric text, ruby and romaji from the referenced lyric)
  • TimeTag (will sync the time-tag also)
• Start time and end time(?)
• Singer
• Translate
• Language

Another concept:

1. Sync property (assign the offset time is needed)
   • Allow customized singers (or called Sync the singers with default true)
   • Allow customized time-tags (or called Sync the time-tags with default true)
2. Reference rhythm (maybe will show referenced lyric's time-tag in the record or modify mode).