Add an HTML audio player

node/Makefile

node/bindata.go

node/debug.go

node/http.go

node/static/css/player.css

node/static/css/player.css.br

node/static/css/player.css.gz

node/static/js/player.js

node/static/js/player.js.br

node/static/js/player.js.gz

node/static/speaker.svg

node/static/speaker.svg.br

node/static/speaker.svg.gz

node/templates/index.html

node/templates/player.html