Rename Statemint to Asset Hub (#2633)

* change dir names

* cargo toml updates

* fix crate imports for build

* change chain spec names and PR review rule

* update cli to accept asset-hub

* find/replace benchmark commands

* integration tests

* bridges docs

* more integration tests

* AuraId

* other statemint tidying

* rename statemint mod

* chain spec mod

* rename e2e test dirs

* one more Runtime::Statemine

* benchmark westmint

* rename chain spec name and id

* rename chain spec files

* more tidying in scripts/docs/tests

* rename old dir if exists

* Force people to manually do the move.

(Safer as there could be additional considerations with their setup)

* review touchups

* more renaming

* Update polkadot-parachain/src/command.rs

Co-authored-by: Bastian Köcher <git@kchr.de>

* better error message

* do not break on-chain spec_name

* log info message that path has been renamed

* better penpal docs

---------

Co-authored-by: gilescope <gilescope@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: parity-processbot <>

cumulus/parachains/runtimes/assets/README.md

@@ -1,9 +1,9 @@
 # Assets Parachain
 
-Implementation of _Statemint_, a blockchain to support generic assets in the Polkadot and Kusama
-networks.
+Implementation of Asset Hub, a blockchain to support generic assets in the Polkadot and Kusama
+networks. Asset Hub was formerly known as "Statemint".
 
-Statemint allows users to:
+Asset Hub allows users to:
 
 - Deploy promise-backed assets, both fungible and non-fungible, with a DOT/KSM deposit.
 - Set admin roles to manage assets and asset classes.
@@ -13,11 +13,11 @@ Statemint allows users to:
 - Transfer (and approve transfer) assets.
 - Interact with the chain via its transactional API or XCM.
 
-Statemint must stay fully aligned with the Relay Chain it is connected to. As such, it will accept
+Asset Hub must stay fully aligned with the Relay Chain it is connected to. As such, it will accept
 the Relay Chain's governance origins as its own.
 
 See
-[the article on Statemint as common good parachain](https://www.parity.io/blog/statemint-generic-assets-chain-proposing-a-common-good-parachain-to-polkadot-governance/)
+[the article on Asset Hub as common good parachain](https://www.parity.io/blog/statemint-generic-assets-chain-proposing-a-common-good-parachain-to-polkadot-governance/)
 for a higher level description.
 
 Wallets, custodians, etc. should see