Improved DetectionWindow class & swipe tracking

DetectionWindow class is now more easy to instaciate :
Contrcutors are easier to use.
Constructor now handles the docking by itself

DirectionalSwipeScript now track Directional swipe by measuring the
angle between (vector2)startpos and (vector2)touch.position and a
reference.

CharacterState has been debugged
EnumScreenCorner has a new enumerator NONE

Sometimes the script DirectionalSwipeScript doesn't detect  a touch :
the cause has not been found yet