Solver improvements and fixing, Cut fixing

Worked at improving the Cut feature. Solved a crash that was appearing when the Cut was made having as reference an ellipse shape.
Started preparing at the geometric solver parallel line detection. Will work at finishing this and after that will continue improving the solver and the magic point drawing. Will also research on some classes found in OCC derived from AIS_Relation like AIS_MidPointRelation that might be useful for this task.
Will also work at fixing the Cut. Found situations when if applying two Cuts one after another if changing the color of the first Cut the model is rebuilt incorrectly.