Support zipping of all Wodo.CollabTextEditor files (without any backends)

Not yet designed to be a real product, but as is useful to get the bundle of needed files to deploy for the Blink and Typist projects.

Target "collabeditor" and "splitscreeneditor" still work for me as before. For next week I plan to make the pullbox files a product of its own as well, as something that could be deployed for the pullbox testing server and owncloud documents. And turn splitscreeneditor into a real own (testing) product as well, with only the files in the result dir it needs. But not yet thought more about this.