* pr/4309:
  Polish contribution
  Polish docs

I don't think we want to keep this on a single line.

Closes gh-4309

See gh-4309

Closes gh-4159

Closes gh-3438

Closes gh-4153

Closes gh-4293

Previously, NamePatternFilter looked for “*”, “$”, “^”, or “+” when
trying to identify a string as being a regular expression. This meant
that it missed the use of a character class ([a-z], for example). This
commit adds “[“} to the list of characters that are considered to be
part of a regular expression.

Closes gh-4233

Closes gh-4193

See gh-4263

Closes gh-4263

Closes gh-4257

Make sure that the remote URL does not contain a trailing slash.

Closes gh-4297

It doesn't appear to be in Maven Central and it's breaking the eclipse
setup.

As the Windows service support is not related at all to the executable
jar support it needs to be in a separate location.

* pr/4272:
  Fix broken links

Closes gh-4272

Improve the initial PR to include a filtering of the profiles that were
already enabled via the `spring.profiles.active` property.

Also add more tests to prove that each profile is loaded only once
now.

Closes gh-4273

The problem fixed here is that the Loader keeps track of the profiles it
is going to look at for loading files, but ignores any that were already
active in the Environment if the listener is called initially with
spring.profiles.active not empty.

Closes gh-4261

Closes gh-4268

* pr/4265:
  Fix error messages

Closes gh-4265

Closes gh-4262

Previously, the `PORTFILE` system property was not checked if the
`EmbeddedServerPortFileWriter` was created using the default constructor.

This had the effect to prevent overriding of the port file when this
listener is created without any file or via `META-INF/spring.factories`.

Closes gh-4254

Update the "INIT INFO section" of `launch.script` to include
`initInfoProvides`, `initInfoShortDescription` and `initInfoDescription`
property substitutions.

The Maven plugin has been updated to populate substitutions with
`${project.artifactId}`, `${project.name}` and `${project.description}`.

Fixes gh-4245

* pr/4189:
  Replace Base64Encoder with Base64Utils

Replace the custom Base64Encoder class with Spring's Base64Utils which
since 4.2 can encode bytes using Java 8's encoder, commons-digest or
Java 6's JAX-B encoder.

Closes gh-4189

* pr/4242:
  Make response headers optional in /trace endpoint

Update `WebRequestTraceFilter` so that the response respects the
TraceProperties.Include.RESPONSE enum.

See gh-3948
Closes gh-4242

Effectively revert commit b396d0d2 to restore exception first logging
of exceptions for Logback and Log4j2.

This commit also introduces new extended versions of "whitespace"
padding exception loggers so that source jar information is still
included in the stacktrace.

Fixes gh-4247

Use an order relative to REQUEST_WRAPPER_FILTER_MAX_ORDER.

Closes gh-2637