Move boolean operations from shape to bool

[carlos-adir]

Currently the boolean operation between two shapes is made by FollowPath, which is inside the file shape.py.
The proposition is to move this responsibility to a new file called bool.py.

The main problem is: these functions receives BaseShape entities, Therefore we would have a circular import.
They are used to know if the midpoint of a segment is inside/outside the other shape.

A solution is to create a JordansContainer, like a tuple(tuple(JordanCurve)), that is used as input/output for a boolean operation.