Documentation for new wizard

This provides documentation for users on how to use the new wizard and documentation for developers on how to write an extension for the wizard.

For the release notes we should also include a note that users must enable the new wizard menu in their perspective manually.
s/is. that/is that/
s/own kinds/own file kinds/
s/Though, this requires that an OSGi bundle is provided/However, this requires that an OSGI bundle be provided/