Add a new interactive property-widget for coordinate frames.
- Unlike the plane widgets, a coordinate-frame widget specifies a base point plus three orthogonal, unit-length axes (not just a base point and a single normal).
- The pqCoordinateFramePropertyWidget class has a widget that allows users to set axes exactly via numeric entry or interactively by snapping the origin to surfaces/surface-points and the axes to surface normals or toward destination points.
- Add a missing property to the display-sized plane widget to allow control over its bounding-box rendering.