- When accessing menu stop music, when start is clicked start music X
Merge branch 'master' into dev

* master:
  Final Documentation ready, except for chema conclusion
Fix Game Music: Off feature so that music is not heard when off
Add credit handler to show credits button
Add action when user satifies winning conditions
Add music when player wins
Fix problem with the clearing of the current level
Fix sound problem when treasure is captured
The drawing of objects on the screen uses the class_map from the current level.
Move pickUp, drop and toggle to Character class