In the last two days started fixing bugs. Put back on working state the 2D, 3D shapes tools, Cut and Extrude. Fixed bugs related to duplicate shape drawing and shape intersection on these tools.
Modified the Rectangle tool to draw rectangles instead of parallelograms, not enabled yet the latest implementation as it has some functionality conflicts with the constraints code. Will finalize it tomorrow.
Remained to put back in working state the translate, offset, mirror tools, some fixes at spline.