Bug 1074622 - [Stingray] Scaffold the TV browser

* Clone apps/browser to tv_apps/browser.
* Restructure HTML structure and style for TV browser UI.
* Draft modules for TV browser.
It's carried over from the cancel-button style of the old browser app. It's the alias of <position> [ / <bg-size> ] . Once our visual design finished and the new icon for this is available, it'd be changed. I personally prefer self explained naming than this kind of alias.