Cleaning up transfer function widgets.
Cleaning up issues with the context-items related to tranfer function editor. + Added support for log-mapped color-transfer function. We ensure that when using log-scale, the color transfer function widget also enter log-space. + vtkPiecewiseControlPointsItem had a bug resulting it deleting of end points even when told otherwise. Fixed that. + Added new event vtkControlPointsItem::PointsModifiedEvent which if fired when control points are changed making it easier for application to do something when the points are changed. + Improved the usability by adding ability to label control points. Change-Id: If02bc1139f6ccb3d7c2198b07d10491f902bafda
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