LyricOn and LyricOff

[Ian Hawthorn]

Suggested feature: Commands (e.g.) `\LOn' and `\LOff' to turn on and off
the synchronisation of lyrics  and avoid overuse of  `_'. For example

{ \LOff b4 a g a |  \LOn b b b r  | \LOff a a a r | b d d r }
addlyrics { lit -- tle lamb }

To give the same result as

{  b4 a g a |  b b b r  | a a a r | b d d r }
addlyrics{ _ _ _ _ | li -- tle lamb | _ _ _ | _ _ _ }

Sometimes I feel like I am drowning in  _ _ _ _ | _ _ _ _ | _ _ _ _ and
it is so easy to lose count or forget to take account of a tie and end
up with the words out of synch.

Best Wishes
Ian H