Closes gh-11221

Closes gh-11474

Previously, the Docbook Maven plugin would generate an epub archive
with the majority of contents in OEBPS/, including content.opf, while
the META-INF/container.xml file reference to content.opf in the root
of the archive.

This commit overrides the epub.oebps.dir variable to move the content
into the root of the archive where it's expected to be. Implementing
this override highlighted that our customization stylesheet was not
being applied as the configuration property was incorrect (it was
epubCustomnization rather than the required epub3Customization). This
has been corrected along with a problem with missing images that
fixing it revealed.

Closes gh-11470

This version is compatible with JDK9 libraries; this is now required
since Jetty introduced a dependency on ASM 6.0 in gh-11469.

Closes gh-11469

Closes gh-11455

Closes gh-11459

* pr/11460:
  Fix typos

Closes gh-11460

Closes gh-11468

* pr/11451:
  Polish

Closes gh-11451

* pr/11450:
  Fix typos

Closes gh-11450

* pr/11456:
  Update copyright header

Closes gh-11456

* pr/11448:
  Polish

Closes gh-11448

* pr/11443:
  Fix property names in MeterBindersConfiguration

Closes gh-11443

Fixes gh-11024

* pr/11403:
  Polish "Improve Spring Data Web configuration properties"
  Improve Spring Data Web configuration properties

Closes gh-11403

See gh-11403

This commit adds GC and thread jvm metrics to the existing memory
metrics. All three are now managed by a unique
management.metrics.binders.jvm.enabled property.

Closes gh-11425

* pr/11235:
  Upgrade to Kotlin 1.2

apiVersion and languageVersion options are set to 1.1
in order to avoid incompatibilities with Kotlin 1.1
based projects.

Closes gh-11235