First feedback

Got my first feedbacks on v20.

• spike timing is to harsh -> added more tolerance
• wall jump is hard to master -> it will now trigger even if you are not touching the wall
• a bug (player clipped in the ground when dashing in a breakable wall) X could not reproduce this, change round corner just in case
• oh and I included version compatibilty for saving/loading
• slam attack using jump and down is not intuitive X
  
• some french text are not translated X will need to complete translations