Includes JRuby 9.2.5 and Jetty Reactive HttpClient 1.0.2.

Issue: SPR-17605

Issue: SPR-17619

Issue: SPR-17623

* pr/2052:
  Polish "Join identical catch branches"
  Join identical catch branches

Closes gh-2052

See gh-2052

* pr/1452:
  Polish "Refactor duplicate code"
  Refactor duplicate code

Closes gh-1452

See gh-1452

Issue: SPR-17558
Closes gh-2054

This commit optimizes the `CharSequenceEncoder` to allocate `DataBuffer`
instances with a predicted capacity.

Issue: SPR-17558

Since SPR-17558, `DataBuffer` now offers a new method to write Strings
to them. This commit makes `CharSequenceEncoder` use that.

Issue: SPR-17558

Prior to this commit, one could write a `CharSequence` to an existing
`DataBuffer` instance by turning it into a byte array or `ByteBuffer`
first. This had the following disadvantages:

1. Memory allocation was not efficient (not leveraging pooled memory
when available)
2. Dealing with `CharsetEncoder` is not always easy
3. `DataBuffer` implementations, like `NettyDataBuffer` can use
optimized implementations in some cases

This commit adds a new `DataBuffer#write(CharSequence, Charset)` method
for those cases and also an `ensureCapacity` method useful for checking
that the current buffer has enough capacity to write to it..

Issue: SPR-17558

This commit makes TomcatServerHttpRequest aware of
HttpServletRequestWrappers, and TomcatServerHttpResponse aware of
HttpServletResponseWrappers.

Issue: SPR-17611

Issue: SPR-17609

* pr/2057:
  Polish "Fix method name in comment"
  Fix method name in comment

Closes gh-2057

See gh-2057

Issue: SPR-17410
Issue: SPR-17433

Includes DefaultRequestBodyUriSpec pre-resolving URI for HttpRequest.

Issue: SPR-17571

Issue: SPR-17155

Issue: SPR-17601

String.indexOf() expressions can be replaced with a call to the String.contains() method available in Java 5 and newer.

* pr/2050:
  Fix sample in EnableAsync Javadoc

Closes gh-2050

Issue: SPR-17565

Issue: SPR-17597

Issue: SPR-12886

Issue: SPR-17574

Replace the full category capped at 36 chars with the class name only
and 1 char per package, e.g. org.apache.commons.Foo -> o.a.c.Foo

Issue: SPR-17568

Issue: SPR-17546

To allow sub-classes to register additional MVC infrastructure.

Issue: SPR-17520

Includes upgrade to JarJar 1.7.2 and Tomcat 9.0.14.

Issue: SPR-17595