4.16.0 - The big refactor, and more

The big refactor, and more

• Refactor the code
  --> This resolves #1964
• Upgrade from "boto" to "boto3"
  --> This resolves #1961
• Add "ProxyConnectionException" with a retry
  --> This resolves #1963
• Add "SCREENSHOT_WITH_BACKGROUND" to settings
  --> This resolves #1962
• Improve undetected mode ("--uc")
• Add new method: "is_online()"
• Refresh Python dependencies

What's Changed

• The big refactor, and more by @mdmintz in #1965

Full Changelog: v4.15.15...v4.16.0