contracts: Add new seal_call that offers new features (#8909)

* Add new `seal_call` that offers new features

* Fix doc typo

Co-authored-by: Michael Müller <michi@parity.io>

* Fix doc typos

Co-authored-by: Michael Müller <michi@parity.io>

* Fix comment on assert

* Update CHANGELOG.md

Co-authored-by: Michael Müller <michi@parity.io>

substrate/frame/contracts/src/lib.rs

@@ -562,12 +562,11 @@ pub mod pallet {
 		ContractTrapped,
 		/// The size defined in `T::MaxValueSize` was exceeded.
 		ValueTooLarge,
-		/// The action performed is not allowed while the contract performing it is already
-		/// on the call stack. Those actions are contract self destruction and restoration
-		/// of a tombstone.
-		ReentranceDenied,
-		/// `seal_input` was called twice from the same contract execution context.
-		InputAlreadyRead,
+		/// Termination of a contract is not allowed while the contract is already
+		/// on the call stack. Can be triggered by `seal_terminate` or `seal_restore_to.
+		TerminatedWhileReentrant,
+		/// `seal_call` forwarded this contracts input. It therefore is no longer available.
+		InputForwarded,
 		/// The subject passed to `seal_random` exceeds the limit.
 		RandomSubjectTooLong,
 		/// The amount of topics passed to `seal_deposit_events` exceeds the limit.
@@ -602,6 +601,8 @@ pub mod pallet {
 		TerminatedInConstructor,
 		/// The debug message specified to `seal_debug_message` does contain invalid UTF-8.
 		DebugMessageInvalidUTF8,
+		/// A call tried to invoke a contract that is flagged as non-reentrant.
+		ReentranceDenied,
 	}
 
 	/// A mapping from an original code hash to the original code, untouched by instrumentation.