Bug 161401 [Viewers] Tweak ColumnViewer-API
- Rename getRowPart(Point point) => getViewerRow() - Rename getCell(Point point) => getViewerCell() - Rename setViewerColumn(final int columnIndex, ViewerColumn viewer) => setupEditingSupport - Make setupEditingSupport() private no one from external needs to use this API to set the EditingSupport for an ViewerColumn
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
private ToolTipSupport tooltipSupport;
	/**
	 * The cell is a cached viewer cell used for refreshing.
	 */
	private ViewerCell cell = new ViewerCell(null, 0);
	/**
	 * Create a new instance of the receiver.