Simple to use editor component (non-collab for now)

This should be the future of the editor component(s). A simple API for 3rd-party WebODF editor interested, hiding all the internal complexity, so allowing us to throw things around as we need, without breaking things too much for that 3rd-party.

`make product-wodotexteditor` will create a zip file with everything needed for the editor component. Unzipping that file and following the HOWTO should make people happy. So far I successfully managed to follow my own text in there and get happy a little :)

Fixes #295 
Partially solved #195 (besides the compilation).
Right ;) Lets find a mate. Well, renamed it to `AE_FILE` for now.... better name hopefully one day in the future, when we have more components and better ideas about the nature of all of them and what keeps them apart. Not user-visible, so should be okay for some time...
Done.