Support landscape and portrait modes

Proposed solutions
===============

* __Portrait mode__
 * Camera in the middle
 * Controls over the camera
 * Speed chosen with a slider at the bottom of the page
 * Informations of the `GameState` message at the bottom
 * Dynamic header on top showing the robot name, score, etc, ..

* __Landscape mode__
 * Camera occupying the 90% of the screen (wide-screen)
 * Sliders at left and right
 * No informations displayed (this will change)