Removed dependance on rococo_parachain_runtime for unrelated stuff (#1500)

* Clean misleading imports `rococo_parachain_runtime::{AccountId, AuraId}`

* Remove dependance on `rococo_parachain_runtime` for unrelated stuff

* fmt + rebase fix

* Addressing review comments

* Addressing review comments

* Fix for `purge_chain_works` works now with `rococo-local` and purge command needs to allow `rococo-native`

parachains/runtimes/starters/shell/src/lib.rs

@@ -59,6 +59,7 @@ pub use frame_support::{
 	StorageValue,
 };
 use frame_system::limits::{BlockLength, BlockWeights};
+use parachains_common::{AccountId, Signature};
 #[cfg(any(feature = "std", test))]
 pub use sp_runtime::BuildStorage;
 pub use sp_runtime::{Perbill, Permill};
@@ -228,11 +229,6 @@ impl sp_runtime::traits::SignedExtension for DisallowSigned {
 	}
 }
 
-/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
-pub type Signature = sp_runtime::MultiSignature;
-/// Some way of identifying an account on the chain. We intentionally make it equivalent
-/// to the public key of our transaction signing scheme.
-pub type AccountId = <<Signature as sp_runtime::traits::Verify>::Signer as sp_runtime::traits::IdentifyAccount>::AccountId;
 /// Index of a transaction in the chain.
 pub type Index = u32;
 /// A hash of some data used by the chain.