@Bean processing explicitly ignores bridge methods (for method overrides with return type narrowing on JDK 8)

Issue: SPR-11718
(cherry picked from commit 656fc52)
Configuration class processing explicitly skips java.* classes since we'll never find @Bean annotations there anyway

Issue: SPR-11718
(cherry picked from commit c8ea80d)
General defensiveness about the bootstrap ClassLoader (i.e. null ClassLoader)

Issue: SPR-11721
(cherry picked from commit 59cef3c)
AbstractMarshaller avoids SAXSource workaround when processExternalEntities=true

Issue: SPR-11737
(cherry picked from commit 93d13cf)
(cherry picked from commit 4196e6c)
Polishing
(cherry picked from commit c97c246)
GenericBeanDefinition's toString() takes parent definition into account

Issue: SPR-9671
Test for overriding singleton @Bean method with scoped proxy in configuration subclass

Issue: SPR-10744
Test for base package specified as config location

Issue: SPR-11647
AspectJExpressionPointcut defensively handles fallback expression parsing

Issue: SPR-9335
Revised @PropertySource parsing for consistent PropertySource naming, avoiding accidental overriding by name

Issue: SPR-11637
Polishing
Document STOMP-related ApplicationContext events

Issue: SPR-11672
Include more guidance about DispatcherServlet context

Also update <mvc:annotation-driven /> comment in XSD.

Issue: SPR-11703
Update RequestMapping javadoc typo.
Polish STOMP documentation
AbstractAdvisingBeanPostProcessor uses target class check for existing proxy but checks against actual exposed object otherwise (catching introductions)

Issue: SPR-11725
Polishing
AbstractAutoProxyCreator and AbstractAdvisingBeanPostProcessor consistently not considering configuration callbacks and internal language interfaces as reasonable proxy interfaces

Issue: SPR-11715
Polishing
Simplify STOMP broker relay integration test

This change simplifies the implementation of the "test" EventPublisher
and MessageHandler used in the STOMP broker relay integration tests.
The updated implementations use a time-limted poll on a BlockingQueue.