Introduced "globalInitializerClasses" next to the existing "contextInitializerClasses", applying to FrameworkServlets as well

Issue: SPR-11314

Issue: SPR-11297

Fixed getTypeDifferenceWeight algorithm in ReflectionHelper, and removed unused argsRequiringConversion storage

Issue: SPR-11306

Issue: SPR-11237

Issue: SPR-11256

Issue: SPR-11301

Better integrated explanation of the 'default' profile with both XML
and Java config examples showing the same thing.

Issue: SPR-11256

Issue: SPR-11307

When adding headers generically, MockHttpServletRequestBuilder now
recognizes Content-Type and updates the contentType field accordingly.

Issue: SPR-11308

Also making 'description' available on SimpleTriggerFactoryBean.

Issue: SPR-9771
(cherry picked from commit 7502ecd3)

This change adds a protected method to DefaultHandshakeHandler to
determine the user for the WebSocket session. By default it's
implemeted to obtain it from the request.

Issue: SPR-11228

The Jetty ServletWebUpgradeRequest implements getUserPrincipal to
return the Principal from the HttpServletRequest on the upgrade.
This change ensures we can fall back on that.

However the JettyRequestUpgradeStrategy still passes the user from
HttpServletRequest from the upgrade, in order to work with Jetty
9.0.x and avoid running into this 9.1.x issue:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=423118

Issue: SPR-11299

This is short to avoid having to use MockMvcRequestBuilders.request()
and instead have a simple patch(url, params...)

Issue: SPR-11304

* pull429:
  Fix various documentation issues

- Remove formatting that interferes with code highlighting
- Fix some XML syntax issues
- Added missing punctuation

* ascidoc-liveupdate:
  Hard-wrap CONTRIBUTING-DOCUMENTATION at 90 chars
  Improve the "contributing documentation" readme

Update the "contributing documentation" readme to include the correct
gradle goal and provide a troubleshooting section.

* SPR-11280:
  Removed reference to Cactus from documentation

Issue: SPR-11280

Corrected documentation regarding the CatchAllConverter in the XStream
javadocs.

The Java and XML config for STOMP WebSocket applications now supports
configuring message converters.

Issue: SPR-11184

* pull432:
  Removed extraneous character from the online documentation