Fixed ClassFilterAwareUnionMethodMatcher equals implementation

Issue: SPR-10604
(cherry picked from commit f329140)
DelegatingFilterProxy avoids synchronization for pre-resolved delegate

Issue: SPR-10413
(cherry picked from commit c26272c)
Restored overridable getXStream() method in Spring Framework 3.2.x

Also setting the bean class loader on the XStream instance itself now.

Issue: SPR-10421
Consistent use of varargs; deprecated setAnnotatedClass method

Issue: SPR-10421
Added javadoc note on the use of CachingConnectionFactory

Issue: SPR-10581
(cherry picked from commit 2626a35)
Further 3.2.4 changelog entries
Polishing
Polishing
Fix SimpleJdbcCall and SimpleJdbcInsert Javadoc

Change "fluid" interface to "fluent" and "string" to "chain", plus fix
few typos in Javadoc.

Issue: SPR-10792
(cherry picked from commit 2344412)
Fix potential security risk when using Spring OXM

Disable by default external entity resolution when using Spring OXM
with jaxb. This prevents a XML entity from being able to resolve a
local file on the host system.

See:
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

Issue: SPR-10806
(cherry picked from commit 7576274)
Further 3.2.4 changelog entries
Release version 3.2.4.RELEASE
Increment version to 3.2.5.BUILD-SNAPSHOT