Fear of View: tutorial mode

Don't worry, I don't plan to spam Antenna every time I update this game. But the main feedback I got (thanks!) after my first release was that it was too confusing, so I've added a little tutorial mode on first play presenting a few short explanatory texts, which I hope improve the situation. In case you want to try it: ssh fov@thegonz.net, password "fov". I also added some further details in the original post.