Exposed all of XStream 1.4's configurable strategies as XStreamMarshaller bean properties

Issue: SPR-10421
Introduced "mapperWrappers" bean property

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

Issue: SPR-10581
Fixed accidental use of JDK 8 getOrDefault method on MultiValueMap

Issue: SPR-10807
Polishing

Issue: SPR-10807
Fix SimpleJdbcCall and SimpleJdbcInsert Javadoc

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

Issue: SPR-10792
Merge pull request #325 from Xaerxess/patch-1

# By Grzegorz Rożniecki
* patch-1:
  Fix SimpleJdbcCall and SimpleJdbcInsert Javadoc
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