Downward & Upward messages (#1266)

* Downward messages, the front-end.

* Move types around to make them accessible from Parachains

* Fix compilation

* Fix branch

* Make it compile for Cumulus

* Update the branch names

* Add default generic parameter

* Implement `Partialeq`

* Move upward messages into the `ValidationResult`

* Support disabling of the runtime api

* Update branch

* Adds support for handling downward messages

* Implement sending XCMP messages as up/downward messages

* service: update to latest ServiceBuilder changes

* Make it compile

* Initial commit

Forked at: ef2aa428d7
Parent branch: origin/master

* Update substrate branch to cecton-update-polkadot-substrate

* Update substrate & polkadot to cumulus-branch

* Reset branch

* Update primitives/src/parachain.rs

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

* Update runtime/common/src/parachains.rs

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

* Update runtime/common/src/parachains.rs

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

* Minor fixes

* Fix wasm build

Co-authored-by: Gav Wood <gavin@parity.io>
Co-authored-by: André Silva <andre.beat@gmail.com>
Co-authored-by: Cecile Tonglet <cecile.tonglet@cecton.com>
Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

polkadot/Cargo.lock

@@ -4319,6 +4319,16 @@ dependencies = [
  "tokio 0.2.21",
 ]
 
+[[package]]
+name = "polkadot-core-primitives"
+version = "0.7.30"
+dependencies = [
+ "parity-scale-codec",
+ "sp-core",
+ "sp-runtime",
+ "sp-std",
+]
+
 [[package]]
 name = "polkadot-erasure-coding"
 version = "0.8.13"
@@ -4446,13 +4456,13 @@ dependencies = [
  "log 0.4.8",
  "parity-scale-codec",
  "parking_lot 0.10.2",
+ "polkadot-core-primitives",
  "sc-executor",
  "serde",
  "shared_memory",
  "sp-core",
  "sp-externalities",
  "sp-io",
- "sp-runtime-interface",
  "sp-std",
  "sp-wasm-interface",
 ]
@@ -4464,6 +4474,7 @@ dependencies = [
  "bitvec",
  "frame-system",
  "parity-scale-codec",
+ "polkadot-core-primitives",
  "polkadot-parachain",
  "pretty_assertions",
  "serde",
@@ -8043,6 +8054,7 @@ dependencies = [
  "parity-scale-codec",
  "polkadot-parachain",
  "sp-io",
+ "sp-std",
  "substrate-wasm-builder-runner 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.5.0",
 ]
@@ -8070,6 +8082,7 @@ dependencies = [
  "parity-scale-codec",
  "polkadot-parachain",
  "sp-io",
+ "sp-std",
  "substrate-wasm-builder-runner 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.5.0",
 ]