Slash Authorities for irrefutable misbehavior (#84)

* double-commit and prepare misbehavior

* get misbehavior on completion

* collect misbehavior on drop, not only on success

* kill unused transaction_index field

* add primitive misbehavior report type

* add misbehavior report transaction

* store prior session

* fix set_items

* basic checks for misbehavior reports

* crate for substrate bft misbehavior checking

* integrate misbehavior check crate

* fix comment

* new wasm binaries

* fix hash in test

* import misbehavior transactions into queue

* fix test build

* sign on digest and full proposal when proposing

* detect proposal misbehavior

* fix fallout

* restore balance/bondage types

polkadot/executor/src/lib.rs

@@ -162,7 +162,7 @@ mod tests {
 		construct_block(
 			2,
 			block1().1,
-			hex!("c8776c92e8012bf6b3f206448eda3f00bca26d77f220f4714c81cbc92a30e1e2").into(),
+			hex!("5604fe023cd6effd93aec9b4a008398abdd32afb3fec988a19aa853ab0424a7c").into(),
 			200_000,
 			vec![
 				Transaction {