The plugin docs are updated to cover the new Android Plugin APIs
and also to describe Federated Plugins. Affected pages include:
    
      Developing packages and plugins
      Developing plugin packages
      Supporting the new Android plugin APIs
      Writing custom platform-specific code

Added an Obfuscating Dart code page.
(Moved from the wiki and updated as of 1.16.2.)

Added a page on using Xcode 11.4 and how to manually update
your project. The tooling, which automatically updates your
configuration when possible, may direct you to this page
if it detects that it’s needed.

Added a page on
Managing plugins and dependencies in add-to-app
when developing for Android.

Other newness: