Ant export should be a separate export option #52

You can export a project as "LibreOffice package" (File->Export).
On the last step, you have a checkbox "Save as Ant script", which generates an Ant script to build the extension without Eclipse.

This is a useful feature, and it should be a separate wizard, not hidden where it is currently.
So the user should be able to see "Generate Ant Script" when going to File->Export, next to "LibreOffice package".