Maintain ALT to activate the selected mouse Pointer. Also possible to ALT LOCK for maintaining the cursor. Local popup window allows selecting. Changed the View options selection to match this popup approach.
For this new MousePointer to snap to grid, a Grid specific for each view is necessary. Grid for moving is orthographic (with an aspect ratio), and grid for mixing or rotation is in polar coordinates. Rendering is done with new Primitives. The entire calculation of grab coordinates is changed to be able to snap to grid coordinates in all circumstances.
