Merge branch 'release/v3.0.0-alpha.1'

Merge branch 'release/v3.0.0-alpha.1'

* release/v3.0.0-alpha.1: (27 commits)
  3.0.0-alpha.1
  Fix version extraction from the git branch
  Update base message, automated translation whitespace handling, Swedish translation
  Refresh messages during standard build
  Use concurrently to run build/watch commands in parallel
  Fix build filename/path mixup
  Use chokidar for watching file changes
  Use webextension-polyfill from npm
  Disallow multiple suspension manager initializations
  Use promises to initialize background script, kill switches to remove broadcast listeners
  Fix broadcast event listener/handler memory leaks/dead objects from popup, as reported by firefox
  Define browser_style for browser_action
  Move suspension manager port listener to iframe in background
  Reduce logging (levels) for known errors
  Add setting logging level to reduce output for non-dev usage
  Safer logging to content page console
  Work around potential innerHTML issues
  Fix layout, links, docs, translations, and more for free/premium chrome/webextension versions
  Automated translations
  Add option to change the rate and pitch per voice
  ...