Fix php 8 deprecation warnings

Merge pull request #343 from mbonneau/event-dispatcher

Drop symfony/event-dispatcher dependency

Crossbar phpunit 8 test issue

Merge pull request #294 from WyriHaximus-labs/react-eventloop-1.0-0.5…

…-0.4

Forward compatibility with react/event-loop 1.0 and 0.5 while still supporting 0.4

Merge pull request #281 from mikesoule/feature/rfc-message-roles

Ensured valid roles in Welcome Message per the RFC spec.

Merge pull request #277 from darthf1/patch-1

Add SF4 support

Removed unnecessary pawl repository

Let InternalClients know when the router is shutting down so they can…

… clean up

Added ability to abort with details fixed minor issues with abort and…

… client getting abort details

Remove version number in ready