Merge branch 'master-v2' into feature/UIMA-6227-Upgrade-to-xmlunit-2

* master-v2: (21 commits)
  [UIMA-6275] InitializableFactory is not smart enough to find a suitable classloader
  [UIMA-6275] InitializableFactory is not smart enough to find a suitable classloader
  [UIMA-6275] InitializableFactory is not smart enough to find a suitable classloader
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6263] CAS validation support
  [UIMA-6264] Switch from DocBook to Asciidoc
  [UIMA-6263] CAS validation support
  [UIMA-6257] Jenkinsfile for uimaFIT
  [UIMA-6257] Jenkinsfile for uimaFIT
  [UIMA-6242] uimaFIT Maven plugin should fail on error by default
  [UIMA-6240] Failure to resolve type system imports when generating descriptors
  ...