app, cursors: add GimpToolTransform3DGrid tool widget
Add a new GimpToolTransform3DGrid tool widget, subclassed from GimpToolTransformGrid, which can be used to perform 3D transformations. The widget can be in one of three modes: CAMERA - allows adjusting the primary vanishing point by moving a handle. MOVE - allows moving the object through dragging. ROTATE - allows rotating the object through dragging. By default, controlling the transformation through dragging applies to the X and Y axes. Holding Shift (or setting the "constrain- axis" property) restricts the motion to only one of the axes. For the MOVE and ROTATE mode, holding Ctrl (or setting the "z-axis" property) allows controlling the Z axis instead. For the same modes, holding Alt (or setting the "local-frame" property), applies the adjustments in the object's local frame of reference, instead of the display's global frame of reference.
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