Introduce BlockExecutionWeight and ExtrinsicBaseWeight (#1023)

* Update to changes in Substrate

* Fix trait

* Remove `TransactionBaseFee`

* add temporary values for extrinsic base weight and block execution weight

* Update Cargo.lock

polkadot/runtime/common/src/attestations.rs

@@ -25,7 +25,7 @@ use frame_support::{
 	decl_storage, decl_module, decl_error, ensure,
 	dispatch::DispatchResult,
 	traits::Get,
-	weights::{MINIMUM_WEIGHT, DispatchClass},
+	weights::DispatchClass,
 };
 
 use primitives::{Hash, parachain::{AttestedCandidate, AbridgedCandidateReceipt, Id as ParaId}};
@@ -134,7 +134,7 @@ decl_module! {
 		type Error = Error<T>;
 
 		/// Provide candidate receipts for parachains, in ascending order by id.
-		#[weight = (MINIMUM_WEIGHT, DispatchClass::Mandatory)]
+		#[weight = (0, DispatchClass::Mandatory)]
 		fn more_attestations(origin, _more: MoreAttestations) -> DispatchResult {
 			ensure_none(origin)?;
 			ensure!(!DidUpdate::exists(), Error::<T>::TooManyAttestations);