[elpa] externals/emms updated (c5040a3402 -> 66baf98e5d)

[ELPA Syncer]

elpasync pushed a change to branch externals/emms.

      from  c5040a3402 * emms-playlist-mode.el: 
emms-playlist-mode-shift-track-up/down
       new  d8162f649c * emms-player-mpv.el: remove long-deprecated 
--input-file=fifo support
       new  a107112d0a * emms-player-mpv.el: remove 
emms-player-mpv-ipc-conn-emacs-26.1-workaround
       new  66baf98e5d * emms-player-mpv.el: fix unnecessary overuse of \\=' 
quoting in docstrings


Summary of changes:
 emms-player-mpv.el | 323 +++++++++++++++--------------------------------------
 1 file changed, 92 insertions(+), 231 deletions(-)