Merge branch 'hotfix/#6071-travis-zip-filter-tests'

Close #6071
Merge branch 'test/#6070-multicheckbox-documentation-test'

Close #6070
Merge branch 'hotfix/#6047-enable-zend-test-controller-tests'

Close #6047
Allow InputInterface retrieval from InputFilterPluginManager
Fixes #6004
Fixes #6045
Add tests for InputFilterPluginManager::validatePlugin()
Adding `@method` annotation to the input filter plugin manager (for type-hinting)
Merge branch 'hotfix/#6046-input-from-input-filter-manager' into develop

Close #6046
Forward Port #6046