API for dynamic object providers

---

	Interface	Description
	ObjectProvider	Provider for a (possibly lazily initializing) instance.
	ObjectProviderFactory	Factory that creates lazy initializing ObjectProvider instances.
	SynchronizedObjectProvider	ObjectProvider extension that allows to add a callback to be invoked when the provided object gets removed from the Context.

	Class	Description
	Provider	Static utility method to create an ObjectProvider for an existing instance.