Changes for 3.0.6

• Added another work-around for Babel transpilation bug.
• Fixed the Robot to handle "Delete" key events.
• Fixed GridLayout when GridLayout.alignment is Position for Parts that have non-zero GraphObject.margin on the left or top sides. Fixed other built-in Layouts that use LayoutNetworks when Nodes have non-zero GraphObject.margin on the left or top sides.

Be sure to see also: https://forum.nwoods.com/t/gojs-3-0-released/16808