Two Line Lyrics Highlight Surport

[sffzh]

When two consecutive lines in the lyrics have the same timestamp, both lines will be highlighted simultaneously. This is to support the display of lyrics that include translated text.

[eddyizm]

Hi @sffzh ,
I tested this today and even though I don't have any lyrics with 2 lines, it seems to have broken the single line lyrics.
I tested on the ampache demo server to see the diff between this PR and the current dev build.

[pgrit]

If #384 should be merged, this can be quite elegantly re-implemented by:

Continuing the for loop until the first line is found that is not playing, and tracking a second endIndex
https://github.com/pgrit/tempus/blob/7a4d2be7b56eb7b99706450a6247016a7f3ff271/app/src/main/java/com/cappielloantonio/tempo/ui/fragment/PlayerLyricsFragment.java#L307

Doing a range check rather than equality for this bool:
https://github.com/pgrit/tempus/blob/7a4d2be7b56eb7b99706450a6247016a7f3ff271/app/src/main/java/com/cappielloantonio/tempo/ui/fragment/PlayerLyricsFragment.java#L328