* MQC auth
Update polkadot
WIP
* Update polkadot
* Silly syntax errors
* Fix typo
* Leave some comments and docs
* Apply suggestions from code review
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
* Introduce the MessageQueueChain structure
* Move the HRMP channel relevance check below
* Fix the `receive_hrmp_after_pause` test
* ValidationData is passed by reference
* Replace "to cumulus" with "to the collator"
* Update the test so that they are same as in polkadot
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>