Introduce Parathreads (runtime) (#341)

* Rest of parathread draft implementation, parachain permissioning.

* Update Substrate

* Update Substrate again

* Integrate weight/fee stuff.

* Council

* Build fixes

* More fixes

* Minor additions

* fix some small errors

* Revert "fix some small errors"

This reverts commit 4fb52c82adfdaf3af98edfe36b280133bcd4f9d3.

* Merge fix.

* do_swap -> on_swap

* Update depdendency to polkadot-master

* Fix more merge problems

* Some patching of errors

* Fix storage closure

* Actually fix storage. It builds!

* Tests run... but not successfully.

* Add `run_to_block` to get parachains active to start

* More `run_to_block`

* Fix build

* Queue up changes to threads

* Move registration test

* Fix regsiter/deregister test

* Retry queue.

* Minor refactor

* Refactor to avoid heavy storage items

* Make tests pass

* remove para on deregister, add events

* Remove println

* Fix register/deregister parathread test

* fix merge

* Parathread can be activated test

* Test auction

* Add `Debtors` storage item

I considered putting the debtor information in `ParaInfo`, but it did not make sense to me since this information only applies to parathreads, not `paras` in general.

* remove comment code

* Some new tests

* Fixes for removing threads when scheduled. Tests.

* Test progression of threads.

* Test that reschedule queuing works properly.

* Make test slightly more interesting

* whitespace

* Swap works properly.

* Update locks

* Build

* Rename can_swap

* Add test for funds to be correctly returned after a swap

Swap does not seem to have logic which correctly swaps the debtor account to the new parathread.

* Make tests consistant

* Add check that `PendingSwap` is cleaned up

* Update runtime/src/parachains.rs

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>

* Update runtime/src/registrar.rs

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>

* Some fixes/suggestions from review

* Docs

* Apply suggestions from code review

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>
Co-Authored-By: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update network/src/gossip.rs

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>

* Rename OnSwap

* Add missing `]`

* Rejig ordering semantics, making everything a bit slower but correct.

* Some Fixes to Parathread Compile (#470)

* Some Fixes

* Fix queue_upward_messages

* Change back to const

* Build fixes

* Fix tests

polkadot/runtime/Cargo.toml

@@ -53,6 +53,7 @@ timestamp = { package = "srml-timestamp", git = "https://github.com/paritytech/s
 treasury = { package = "srml-treasury", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
 
 primitives = { package = "polkadot-primitives", path = "../primitives", default-features = false }
+polkadot-parachain = { path = "../parachain", default-features = false }
 
 [dev-dependencies]
 hex-literal = "0.2.0"
@@ -79,6 +80,7 @@ std = [
 	"codec/std",
 	"inherents/std",
 	"substrate-primitives/std",
+	"polkadot-parachain/std",
 	"client/std",
 	"offchain-primitives/std",
 	"rstd/std",