A3 - General Legend Improvements

Hide legend of hidden plots (ORG-10823)	Reverse Legend Order (ORG-11601)
Click Reconstruct Legend button will hide legends of hidden plots. Right click Legend and choose Show Legend for Visible Plots Only, or open Update Legend dialog, specify show/hide legend of hidden plots	Right click Legend and choose Reverse Order.

Hide Legend for Fitted Curves	Drag and Drop to to arrange legend entries in multiple columns (ORG-11611)
Right click Legend and choose Hide Legend for Fitted Curves, or open Update Legend dialog, specify show/hide legend of Fitted Curves	Select the legend, drag and drop the legend border while pressing Ctrl button, when the horizontal space is enough for more column, the arrangement will change.
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