XCM revamp (#2836)

* Remove unused relaying XCM

* Aggregate HRMP (XCMP/HMP) messages. Payloads for spambot.

* Revert lock

* Fix

* Broken example

* Introduce fee payment mechanics into XCM.

* Weight limitations on XCM execution

* Mock environment for tests and the first test

* Tests for XCM and a few refactors.

* Remove code that's not ready

* Fix for an XCM and an additional test

* Query response system

* XCMP message dispatch system reimagining

- Moved most of the logic into xcm-handler pallet
- Altered the outgoing XCMP API from push to pull
- Changed underlying outgoing queue data structures to avoid multi-page read/writes
- Introduced queuing for incoming messages
- Introduced signal messages as a flow-control sub-stream
- Introduced flow-control with basic threshold back-pressure
- Introduced overall weight limitation on messages executed
- Additonal alterations to XCM APIs for the new system

* Some build fixes

* Remove the Encode bounds sprayed around

* More faff

* Fix bounds amek use latest scale codec.

* remove println

* fixes

* Fix XcmExecutor Tests

* Fix XCM bounds using derivative crate

* Refactor names of XcmGeneric &c into Xcm

* Repot the xcm-executor into xcm-builder

* Docs

* Docs

* Fixes

* Update xcm/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Fixes

* Docs

* Update runtime/parachains/src/ump.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Docs

* Fixes

* Fixes

* Fixes

* Docs

* Fixes

* Fixes

* Introduce transfer_asset specialisation.

* Fixes

* Fixes

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

polkadot/xcm/src/v0/junction.rs

@@ -45,6 +45,10 @@ pub enum Junction {
 	/// An indexed parachain belonging to and operated by the context.
 	///
 	/// Generally used when the context is a Polkadot Relay-chain.
+	///
+	/// There is also `Parachain` which can be used in tests to avoid the faffy `{ id: ... }` syntax. Production
+	/// code should use this.
+	// TODO: parity-scale-codec#262: Change to be `Parachain(#[codec(compact)] u32)`
 	Parachain { #[codec(compact)] id: u32 },
 	/// A 32-byte identifier for an account of a specific network that is respected as a sovereign endpoint within
 	/// the context.
@@ -64,7 +68,7 @@ pub enum Junction {
 	/// An instanced, indexed pallet that forms a constituent part of the context.
 	///
 	/// Generally used when the context is a Frame-based chain.
-	PalletInstance { id: u8 },
+	PalletInstance(u8),
 	/// A non-descript index within the context location.
 	///
 	/// Usage will vary widely owing to its generality.