Finalized implementing a first version of translate Gizmo that applies to all shapes from scene. The Translate Gizmo is displayed on the mass center of the shape. While Gizmos and editing handlers are displayed the shape transparency is set to 50% so that editing handles and gizmos can be dragged even if they are located inside the solid.
As functionality it allows users to translate a shape on one of the X, Y or Z axis or on the XOY, ZOX, YOZ planes.
Fixed the big bugs existing at editing handles and translate Gizmos.
A preview movie of the feature: