Make easier to play video on download

[spaetz]

Videos on the download page can only be interacted with via the "three dots" menu. It would be convenient if eg a click on a video starts playing it. A long press could pop up the context menu, this way the fat-fingered , could easier reach the menu.

[ghost]

The current GigaGet-based download manager is really bad. Once we've finished more important stuff, we'll replace it with a better one we'll write ourselves.

[theScrabi]

closing if favour of #962