Simplified interface, PHP 8 attributes

New Requirements

None

New features

• Added HandlerProviderWithChain, which allows chaining multiple handler providers. They are
  queried in turn until a handler is found.
• Handlers, Permissions, and Voters can now be defined using PHP 8 attributes instead of YAML. Added
  MessageBusPassWithAttributes, and the attributes Handler, Permission, and Vote.

Backward Incompatible Changes

• HandlerProvider::getHandlerForMessage() can now return null, undefined handlers are handled in
  one single location now, that is DispatcherWithHandlerProvider.
• Dropped HandlerProviderPass, CommandDispatcher, CommandHandlerProvider,
  CommandHandlerProviderPass, QueryDispatcher, QueryHandlerProvider,
  QueryHandlerProviderPass in favor of MessageBusPass.
• Dropped ContainerHandlerProvider in favor of HandlerProviderWithContainer.
• Dropped AssertingDispatcher in favor of RestrictedDispatcher.
• Dropped SimpleHandlerProvider in favor of HandlerProviderWithHandlers.
• Dropped SimpleDispatcher in favor of DispatcherWithHandlerProvider.
• Dropped NotFound in favor of HandlerNotFound.

Deprecated Features

None

Other Changes

None

Permissions and voters

This release introduces permissions and voters, the foundation for restricting message dispatching under certain conditions. These changes allow a simplification of the API, and the concepts of "queries" and "commands" is now deprecated.

See MIGRATIONS for details.

Requires PHP 8.0+

Merge pull request #2 from ICanBoogie/2.0

Require PHP 8.0

v1.0.0

Replace broken doc links with internal ones

QueryDispatcher/CommandDispatcher

v0.6.0

Add QueryDispatcher/CommandDispatcher