Screens sketch, hud sketch, basic input handle

I've just pushed a serie of commits adding a sketch for all the screens will need, including basic navigation between them. Also, in the game screen, a first version of our hud can be checked. It has some operation buttons, timer and scores.
Operations input is handled just highlighting the hud buttons.

Much more need to be done =D

To make you laugh a bit, check our screenshots. Yeah, yeah, it's fugly, I know...