* Approve block announcements of backed blocks

If we receive a block announcement without a statement attached that
matches the latest backed block, it is valid and we need to approve the
block announcement to download the block.

* Fix tests

* Approve block announcement if it comes from the best known block

* Fetch backed block only when required

* Declare Error type in decl_module! for parachain-systems

* Declare Error type in decl_module! for xcm-handler

* Update Substrate & Polkadot

* Enforce `ParachainSetCode`

* set_upgrade_block

* Update lib.rs

* Use Two Storage Items for Validation Function Upgrade

* note issue #374

* fix docs nits

* Apply suggestions from code review

* Update pallets/parachain-system/src/lib.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Update Substrate & Polkadot

* Remove `can_set_code` for now

* Fix incorrect prefix for "Prepared block for proposing at"

* Update Substrate & Polkadot

* Fix quotes & codec

* WIP

* Fix logger rename

* Revert "WIP"

This reverts commit af2fe967bb5841a55024783dbccf6c75cba6ab1a.

* WIP

* CLEANUP

* Working state

* WIP

* WIP

* Create builder for test nodes

* Fix syncing issue

* Adds missing file

* Support xcm local execution in xcm handler.

* Add docs.

* Update Substrate & Polkadot

* Remove unused code

* Add a command to purge the relay chain only

* WIP

* Update rococo-parachains/src/cli.rs

Co-authored-by: Bastian Köcher <[email protected]>

* Move cli stuff to its own crate

* Copyright dates

* Test not working for some reason...

* WIP

* Revert "WIP"

This reverts commit f97cd63742c7df822e4a6e52a29db5e0f56b7bfa.

* Fix test to use provided relay chain

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <[email protected]>

* Add hint about which database could not be purged

Co-authored-by: Bastian Köcher <[email protected]>

* Update to latest Substrate and Polkadot

* log::debug!

* Add log dependecies to runtime

* Comma

* Fix tests

Currently validation data is shared by using a well known key between
the parachain system pallet and the validate block implementation. This
pr changes this by passing the parachain system directly to the validate
block implementation to make use of it. Besides that, we also store the
validation params in some thread local variable to make it inspectable
by parachain system. This moves the validation of validation data and
validation params to the parachain system pallet directly, instead of
having this hidden inside the validate block implementation.

Fixes: https://github.com/paritytech/cumulus/issues/217

* Move consensus to consensus-common crate

* Move the parachain consensus out of the collator

* Add first relay chain consensus stuff

* Remove some warnings

* Fix more stuff

* Fix collator test

* Change `ParachainConsensus` to take a mutable self

* Make everything compile

* Feedback

* Update Substrate & Polkadot

* Update chainspecs

* Update again to fix test

This renames and moves the `SystemInherentData` into its own crate.
The struct is now called `ParachainInherentData`. Besides moving the
struct, this also moves the code for creating this struct into this crate.

* Move pallets to pallets folder and rename them

* Move genesis file to service

* Rename primitives to primitives-core

* Delete cumulus-runtime

* Move stuff to client folder and rename

* Update polkadot

* Migrate all uses of MQC heads to merkle proofs

* Mass rename `relay_parent_storage_root`

* Restore parachain-system tests

* Update polkadot and libp2p swarm for testing

* Collapse match into an if let

Co-authored-by: Bastian Köcher <[email protected]>

* Fix compilation error in test-service

Co-authored-by: Bastian Köcher <[email protected]>

* Fix HRMP Location

* Add call to xcm handler

* 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 <[email protected]>

* 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 <[email protected]>

* Block announce validation should use the correct `Validation` result

The error variant is just for internal errors and we need to return
`Failure` always when the other node send us an invalid statement.

* Update network/src/lib.rs

Co-authored-by: Sergei Shulepov <[email protected]>

Co-authored-by: Sergei Shulepov <[email protected]>

* Complete telemetry for parachain & relaychain

* Update Substrate & Polkadot

This changes the collator to print an error if the block that we can not
find is the genesis block, instead of only logging this as a `debug`
message. This should help people when they have registered the wrong
genesis state on the relay chain.