level is created, but tiles are regular (should be random)

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
levels are created (need to check if they are correct)

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>
refactoring

Signed-off-by: Nicolas Cailloux <caillouxnicolas@gmail.com>