Roll animation, MOVABLE & BREAKABLE update

After falling at least during 500 ms, roll animation is automatically triggered at landing.

You can also roll manually using downward arrow after a jump (upward arrow)

MOVABLE blocks (clouds) are now submitted to gravity and stickman moves when pressing M key while touching them. It causes stickman falling with the cloud until jumps are triggered or M key is released. MOVABLE has now a flappy bird-like behavior/physics

Now, BREAKABLE blocks's  (wood) destruction can be triggered simultaneously. They was waiting each other destruction delay before getting removed in the previous version.