Changed the way that the result from the webp test is stored to a more reliable one and the way that imports are made to a more correct one, since the last one had a big switch. It didn't improve in performance but I think this the correct way of doing it in a centered file.

Changed the way that images are loaded, now the browser will use webp when supported, saving data for more limited connections

Signed-off-by: Henrique V. Ehrenfried <hvehrenfried@inf.ufpr.br>

TODO: Iframe exhibition, load images