v3.3.0

• autobuild-web: Settings page is now split into 3 sections:
  settings.web.php, settings.autobuild.php, and settings.farm.php
• autobuild-web: Implemented Build Farm management through web UI
  Can install, upgrade, and remove build farm VMs through
  settings.farm.php
• autobuild-web: Implemented cron jobs
  Auto-delete old builds, auto-delete old logs, auto-upgrade VMs
  Configurable through settings.web.php
• autobuild: Make sure to restore build environment's original state
  if the job is interrupted. In particular, if we're cancelling, we
  need to make sure we clear any 'upgrading' or 'installing' files we
  created
• autobuild-web: Added case-insensitive captcha to the login page
  The debian package php-gregwar- captcha is now a dependency of
  autobuild-web
• autobuild: Fixed a bug where the initrd preseed wasn't always
  properly applied
• autobuild: Now accepts an -i argument (--install-vm), which, when
  paired with one of the options --amd64, --i386, --arm64, does exactly
  what you would expect.
• autobuild: Swapped wget for cURL
• autobuild: Build logs now report success or failure at the end