Use explicit call indices (#12891)

* frame-system: explicit call index

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Use explicit call indices

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* pallet-template: explicit call index

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* DNM: Temporarily require call_index

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Revert "DNM: Temporarily require call_index"

This reverts commit c4934e312e12af72ca05a8029d7da753a9c99346.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/babe/src/lib.rs

@@ -403,6 +403,7 @@ pub mod pallet {
 		/// the equivocation proof and validate the given key ownership proof
 		/// against the extracted offender. If both are valid, the offence will
 		/// be reported.
+		#[pallet::call_index(0)]
 		#[pallet::weight(<T as Config>::WeightInfo::report_equivocation(
 			key_owner_proof.validator_count(),
 		))]
@@ -424,6 +425,7 @@ pub mod pallet {
 		/// block authors will call it (validated in `ValidateUnsigned`), as such
 		/// if the block author is defined it will be defined as the equivocation
 		/// reporter.
+		#[pallet::call_index(1)]
 		#[pallet::weight(<T as Config>::WeightInfo::report_equivocation(
 			key_owner_proof.validator_count(),
 		))]
@@ -445,6 +447,7 @@ pub mod pallet {
 		/// the next call to `enact_epoch_change`. The config will be activated one epoch after.
 		/// Multiple calls to this method will replace any existing planned config change that had
 		/// not been enacted yet.
+		#[pallet::call_index(2)]
 		#[pallet::weight(<T as Config>::WeightInfo::plan_config_change())]
 		pub fn plan_config_change(
 			origin: OriginFor<T>,