[Unit Tests] Add com.archimatetool.testsupport plugin

* Move TestUtils into this plugin to stop a build cycle
[Help Docs] Move Help Docs creation to com.archimate.build project

* Don't add the pdf and doc files to git
* Move this out of the help plugin to keep it clean
Merge branch 'build_help_docs'
Remove org.hamcrest.core from product file

* It's a Junit library