SoftGeometry: Operations for multiple selections on Bevel++

Operations for multiple selections on Bevel++

To select contiguous handles
To select noncontiguous handles
To unselect all handles: SHIFT+Click in any non-active area on the interface.
To unselect a handle: SHIFT+Click a selected handle.
To reverse the state of selected and unselected handles
To move handles
To remove handles
To stretch handles