When enabled, it will hide all AsmElement, and AsmElementLink, and only
shown then when they are selected, or a AsmConstraint object is
selected in the tree view
* Draft wire points can be dragged individually.
* Draft wire individual edge can be moved and rotated.
* Draft circle/arc can be moved and rotated by dragging edge or face.
* Draft circle/arc radius can be changed by dragging vertex
* Draft arc first/last angle can be changed by dragging end points