Closes gh-1440

Closes gh-5964

Closes gh-5963

Closes gh-5962

Closes gh-5961

Closes gh-5960

Closes gh-5959

Closes gh-5958

Closes gh-5957

Closes gh-5955

Closes gh-5953

Closes gh-5952

Closes gh-5951

Closes gh-5950

Closes gh-5940

Closes gh-5949

Closes gh-5947

Closes gh-5946

Closes gh-5945

Previously, arguments passed to the script were handled in one way
if a service was being started using start-stop-daemon and in another
way if start-stop-daemon wasn’t available or the application is being
launched in run mode. This meant that quoted arguments were only 
handled correctly when the application was being started using
start-stop-daemon.

This commit updates the launch script so that argument handling is
the same across all three different way that the application can be
launched.

Closes gh-5942

This commit validates that a `SessionRepository` has been configured if
Spring Boot is meant to auto-configure one.

Closes gh-5943

Commit b7e7bcf7 made `spring.session.store-type` explicit which means that
users of Spring Session in 1.3 have to set that property to restore the
auto-configuration support in 1.4.

This commit implicitly set the store type to redis if redis is present
and log a warning inviting the user to actually specify that in
configuration.

The entry in the auto-configuration report also mentions that such
arrangement is deprecated.

Closes gh-5838

* pr/5938:
  Polish Maven plugin doc

Closes gh-5938

Closes gh-5932

* pr/5931:
  Fix incorrect usage of Assert.notNull()

Closes gh-5931

* pr/5936:
  Polish

Closes gh-5936

* gh-5878:
  Polish "Set default paths for fixed static version" (gh-5878)
  Set default paths for fixed static version

Closes gh-5878

Closes gh-5921

Using a separate thread to call the application's main method is
unnecessary – the context class loader of the current thread can be
updated instead – and makes exception and exit code handling more
complicated than it needs to be.

This commit updates the Launcher so that it calls the main method
runner using the current (main) thread. As a result, any exception
that's thrown will be caught by the JVM and result in a non-zero exit
code being returned from the process.

Closes gh-5922

See gh-5711

This commit deprecates the `ws` starter in favour of a new `web-services`
starter. A deprecation warning auto-configuration has also been added to
the ws starter.

Closes gh-5711

* pr/5925:
  Polish