OpenHarmony 0.3.0

new functions to convert to/from scene coordinates to drawing space in oPoint
fixes:
oDrawingNode.exposeAllDrawings,
oDrawingColumn.extendExposures,
oDrawingColumn/oDrawingNode.duplicate()
oDrawing.pivot
replace broken reference oDrawingLayer with oArtLayer (Thanks to https://github.com/jdresner for his contribution)