* Multiple fix ups

* Remove missed HrmpOpenChannelRequestCount

* Fix the invariant string for HrmpOpenChannelRequestCount

* Update roadmap/implementers-guide/src/types/candidate.md

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Add small clarification

* Fix another small typo

* Add a clarification to InboundHrmpMessage.sent_at

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Add a note about time of collection of TransientValidationData

* Add HRMP digest and dmq length to TransientValidationData

* Add a note that the vector in hrmp digest is never empty

* Add hrmp watermark to TransientValidationData

* Add HRMP egress limits

* Incorporate the latest dispatchable upward messages changes.

* Update candidate.md

* Update candidate.md docs

* Fix wording

* Delete assignmets.md

* Update roadmap/implementers-guide/src/types/candidate.md

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Extract HrmpTransientValidationData and add additional data.

* Some clarifications.

* Introduce HrmpAbridgedOpenChannelRequest

* Update roadmap/implementers-guide/src/types/candidate.md

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Fix typo: egress->ingress

* A note about sorting

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Draft HRMP related message types

* Make HRMP use upward message kinds

* Incorporate changes into messaging.md

* Make docs a bit more clear

* Clarify remove "D"

* Update roadmap/implementers-guide/src/messaging.md

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Update roadmap/implementers-guide/src/runtime/router.md

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Update router.md

* Update roadmap/implementers-guide/src/runtime/router.md

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* Take 2 at the upward messages

* Trying to restore stuff from unsuccesful rebase

* Fix whitespace

* Clean up

* Change rustdoc to comment

* Pivot to a less stricter, w.r.t. to acceptance, model

* Rename `max_upward_message_num_per_candidate`

* Update docs for DownwardMessage

* Apply suggestions from code review

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* Rephrase "Dispatchable objects ready to ..."

* Finish the sentence

* Add a note about imprecision of the current weight formula

* Elaborate on potential use-cases for the upward message kinds.

* s/later/below

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* First stab at downward messages.

That also includes a notion of horizontal messages.

* Add some structure to the router.

* Update `ValidationOutputs`

* Add `processed_downward_messages` to `ValidationOutputs`.

Forgot to check that in.

* s/AccountId/ParaId

* DownwardMessage::ParachainSpecfic

* s/ensure_horizontal_messages_fits/ensure_horizontal_messages_fit

* Clarify that Router called for each candidate

* Update the preamble for Router.

* Rewrite the relay-chain extrinsic routines

* Update gloassary

* Add DMP to the glossary

* If the queue is empty, `processed_downward_messages` can be 0

* WIP

* Add condemned list

* Pivot to message-storing channel based HRMP

* Finished draft

* Tidy up

* Remove a duplicate glossary entry

* Fix typo

* Fix wording to emphasize that the channel is unidirectional

* Proper decrement `HrmpOpenChannelRequestCount`

* Add a comment for `HrmpOpenChannelRequestCount`.

* Remove old configuration values.

* Be more specific about the para{chain,thread} hrmp chan limits.

* Fix indentation so the lists are rendendered properly

* "to answer **the**" question instead of "a"

* Add a missing call to `check_processed_downward_messages`

* Clean more stuff during offboarding

* Fix typo

* Fix typo for the config

* Add a call to `prune_dmq`

* Add explicit invariants for ingress/egress indexes

* Add comments for the sender/reciever deposit config fields

* Document various fields and structs in Router module

* More docs

* Missing docs in Candidate.md

* Tabs to spaces in router.md

* Apply Rob's suggestion

* Add the hrmp_ prefix to the router messages

* Those are entry points

* Use SessionIndex type for the `age` field

* Use a struct to represent `HrmpChannelId`

* Put only MQCs into the LocalValidationData

* Close request can be initiated by the runtime directly

* Close request can be initiated by the runtime directly

* tabs/spaces

* Maintain the list of the outgoing paras in Router

* Update roadmap/implementers-guide/src/runtime/inclusion.md

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* fix typo

* Remove an unnecessary pair of code quotes

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* rename implementor's guide to implementer's guide

* fix typos in more places

* Router module initial commit

* Add the router.md itself

* Enqueue only on enact_candidate

* Initialization concerns

* Ignore the snippet

* Update roadmap/implementors-guide/src/runtime/router.md

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* Dispatch messages on finalization

* More fixes from review

* Update roadmap/implementors-guide/src/SUMMARY.md

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* Adds router to initializer order

* Adds messages.md

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>