add settings menu to toggle setting storage

_locales/en/messages.json

build/js/app.js

icons/16.png

icons/32.png

icons/48.png

icons/64.png

manifest.json

web/fonts/liberation-sans/liberation_sans/AUTHORS

web/fonts/liberation-sans/liberation_sans/COPYING

web/fonts/liberation-sans/liberation_sans/ChangeLog

...s/liberation-sans/liberation_sans/LiberationSans-Bold.ttf

...ration-sans/liberation_sans/LiberationSans-BoldItalic.ttf

...liberation-sans/liberation_sans/LiberationSans-Italic.ttf

...iberation-sans/liberation_sans/LiberationSans-Regular.ttf

web/fonts/liberation-sans/liberation_sans/License.txt

web/fonts/liberation-sans/liberation_sans/README

...fonts/liberation-sans/liberation_sans/liberation-sans.css

web/settings/index.css

web/settings/index.html

web/settings/index.js