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).
Well... even sample files will be copied and pasted into production code  :baby_chick:.

My preference here would be ``console.log`` instead, or an outright ``throw new Error(err)`` (though, that is not the correct pattern for callbacks such as this). These are both "better" choices for production code in my opinion.

Though... I would not hold up the patch for something as small as this. There are no major problems using alert, I suspect I'm overly sensitive because I sometimes forget to comment them out of ``runtime.js`` when unleashing Bella, and come back the next day to see she has been stuck all night waiting for me to press "Ok"  :stuck_out_tongue_closed_eyes:.