Remove the ability to bind global error channel directly to a broker destination through error.destination property.
The preferred way to consume error messages in a brokder destination is through the binder specific DLQ mechanism.
Global error channel may still be consumed by a ServiceActivator or StreamListener, but it is not bound to a broker destination.
Remove the internal bridge channel from the global error channel that is used for content type conversion.
Remove tests associated with this feature.
Deprecate class `SingleBindingTargetBindable` as this is not used by the framework any longer.
Docs polishing.
Resolves#1398Resolves#1401Resolves#1269
a82c906913