[x3d-public] X3DJSAIL. Consider adding addChild() methods to these.

[yottzumm at gmail.com]

Consider adding some form of addChild methods (perhaps more than one method for multiple types) to these types, and any corresponding concrete classes (*Object):

X3DGroupingNode
Contour2D
GeoLOD
Layer
CADPart
X3DViewportNode
LayoutLayer
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