v4.0.0

• Update dependencies
• Show progress spinner whilst installing the core
• Show progress spinner whilst testing configuration
• Make the service unavailable (it was already deprecated)
• Rename package to php-ide-serenata to reflect new name of project
• Integrate annotations and refactoring from the annotations and refactoring packages
  • The new functionality is equivalent to that supplied by the separate packages
  • Both can be disabled via the settings if you don't want them
  • This is the first step towards integrating this functionality into the core fully in the long term
  • This will also help discoverability, since I notice a lot of users don't notice other packages are available, and is less of a hassle
• private is now the default access modifier when extracting methods