Add missing docblocks
Register default invokables
Use InputFilterPluginManager in InputFilter\Factory
Inject InputFilterPluginManager in InputFilter\Factory
And rename $element to $inputFilter
Inject InputFilterPluginManager in Form\Factory::inputFilterFactory
Merge pull request #4365 from Danizord/hotfix/inputfilter-factory-use-plugin-manager

Use InputFilterPluginManager in InputFilter\Factory
[#4365] Fix failing tests

- Check if the composed service locator has the InputFilterManager prior
  to attempting to retrieve it.
Merge branch 'feature/4365' into develop

Close #4365