Issue #1393 Angle constraint : incorrect angle displayed. solution: do not select...

Issue #1393 Angle constraint : incorrect angle displayed. solution: do not select any object in the viewer when passed through point widget is active. This commit is a validator creator for such widgets(a candidate to replace WidgetValidated). It is used now for Distance of Circle widget and Flyout point of dimensional constraints. The next integration is for the bug purpose(arc's passed point)