Move from bounds on low-level objects to BP Send bounds

Rather than bounding the traits used in `OutputSweeper`, move the
bounds to where we actually require them - a top-level `Send` bound
on the `Deref`-to-`OutputSweeper` type itself.

Author: TheBlueMatt

lightning-background-processor/src/lib.rs

@@ -807,7 +807,7 @@ pub async fn process_events_async<
 ) -> Result<(), lightning::io::Error>
 where
 	UL::Target: 'static + UtxoLookup,
-	CF::Target: 'static + chain::Filter + Sync + Send,
+	CF::Target: 'static + chain::Filter,
 	T::Target: 'static + BroadcasterInterface,
 	F::Target: 'static + FeeEstimator,
 	L::Target: 'static + Logger,
@@ -991,15 +991,15 @@ impl BackgroundProcessor {
 		D: 'static + Deref,
 		O: 'static + Deref,
 		K: 'static + Deref,
-		OS: 'static + Deref<Target = OutputSweeperSync<T, D, F, CF, K, L, O>> + Send + Sync,
+		OS: 'static + Deref<Target = OutputSweeperSync<T, D, F, CF, K, L, O>> + Send,
 	>(
 		persister: PS, event_handler: EH, chain_monitor: M, channel_manager: CM,
 		onion_messenger: Option<OM>, gossip_sync: GossipSync<PGS, RGS, G, UL, L>, peer_manager: PM,
 		liquidity_manager: Option<LM>, sweeper: Option<OS>, logger: L, scorer: Option<S>,
 	) -> Self
 	where
 		UL::Target: 'static + UtxoLookup,
-		CF::Target: 'static + chain::Filter + Sync + Send,
+		CF::Target: 'static + chain::Filter,
 		T::Target: 'static + BroadcasterInterface,
 		F::Target: 'static + FeeEstimator,
 		L::Target: 'static + Logger,

lightning/src/util/sweep.rs

@@ -346,7 +346,7 @@ where
 	B::Target: BroadcasterInterface,
 	D::Target: ChangeDestinationSource,
 	E::Target: FeeEstimator,
-	F::Target: Filter + Sync + Send,
+	F::Target: Filter,
 	K::Target: KVStore,
 	L::Target: Logger,
 	O::Target: OutputSpender,
@@ -368,7 +368,7 @@ where
 	B::Target: BroadcasterInterface,
 	D::Target: ChangeDestinationSource,
 	E::Target: FeeEstimator,
-	F::Target: Filter + Sync + Send,
+	F::Target: Filter,
 	K::Target: KVStore,
 	L::Target: Logger,
 	O::Target: OutputSpender,
@@ -914,7 +914,7 @@ where
 	B::Target: BroadcasterInterface,
 	D::Target: ChangeDestinationSourceSync,
 	E::Target: FeeEstimator,
-	F::Target: Filter + Sync + Send,
+	F::Target: Filter,
 	K::Target: KVStore,
 	L::Target: Logger,
 	O::Target: OutputSpender,
@@ -928,7 +928,7 @@ where
 	B::Target: BroadcasterInterface,
 	D::Target: ChangeDestinationSourceSync,
 	E::Target: FeeEstimator,
-	F::Target: Filter + Sync + Send,
+	F::Target: Filter,
 	K::Target: KVStore,
 	L::Target: Logger,
 	O::Target: OutputSpender,