JmsListener/ScheduledAnnotationBeanPostProcessor uses SmartInitializingSingleton instead of ContextRefreshedEvent

Also reducing the container dependencies to BeanFactory instead of ApplicationContext, wherever possible.

Issue: SPR-12039
Polishing
Groovy loader should delegate to XML loader in the TCF

If a resource location in the MergedContextConfiguration has a ".xml"
extension, the GenericGroovyXmlContextLoader now delegates to a
dedicated XmlBeanDefinitionReader for loading bean definitions from that
resource, thus preserving XML validation for all XML resource locations.
For all other extensions (presumably only ".groovy"), the
GenericGroovyXmlContextLoader delegates to a GroovyBeanDefinitionReader.

Issue: SPR-11233
Document default locale in MockHttpServletRequest

This commit updates the class-level Javadoc for MockHttpServletRequest
with information regarding the default locale for the mocked server.

Issue: SPR-11701
Document that mock request doesn't support Accept-Language header

This commit updates the Javadoc for getLocale() and getLocales() in
MockHttpServletRequest to point out that the mock implementation does
not comply with the the Servlet specification with regard to the
Accept-Language header.

Issue: SPR-12043
Split configuration constants into local XConfigUtils classes instead of piling them up in AnnotationConfigUtils
AbstractTypeHierarchyTraversingFilter leniently ignores non-loadable super classes and interfaces

Issue: SPR-12042
Polishing
Latest dependency updates (Groovy 2.3.5, Hibernate Validator 4.3.2 & 5.1.2, Jetty 9.2.2)
Polishing
Extract base interface for VersionStrategy

This change splits out a base VersionPathStrategy interface that
focuses on where in the URL path the version is embedded.
Rearranged statement whitespace in Velocity macros
Polishing
JmsMessagingTemplate exception management

This commit introduces MessagingExceptionTranslator, a messaging
exception translation infrastructure similar to what
PersistenceExceptionTranslator provides.

JmsMessagingTemplate does not throw raw JmsException anymore but
translates those to an instance of Spring's MessagingException
hierarchy.

Issue: SPR-12038
Polishing
Latest dependency updates (Groovy 2.3.6, H2 1.4.180)
MessagingExceptionTranslator lives in support subpackage now

Issue: SPR-12038
Update constructor for AbstractJsonpResponseBodyAdvice
Cope with generic methods during SpEL compilation

This commit allows the SpEL compiler to cope with generic methods
being used in expressions involving numeric operands. Due to the
use of unbound type variables the methods may look like they
return Object but in fact they are returning objects of a numeric
type that are suitable for compilation. The changes here ensure
the runtime types are looked at if the discovered declared types
are not providing enough information. This impacts all the
operands involving numerics (mathematical and relational).

Issue: SPR-12040
Support compilation of the SpEL operator OpModulus

This commit enables the modulus operator to be compiled when
it is used as part of a SpEL expression.

Issue: SPR-12041