Succeeded to make the edit mode flow work at the Sketcher. The shapes can be selected, edited and after that, unselected. It remained to solve one bug: the last shape drawn is not editable. For example if there are three lines drawn the first two can be edited the last can't. Another improvement that needs to be added is that after one shape is modified the Solver needs to be informed about the new position of the magic points.
Worked also at improving the ellipse drawing. The drawing goes realtime, many of the bugs/crashes were removed.
Will continue working at finishing the edit mode and after that will start making some test code for it.