Bug 36519 [call hierarchy] ability to copy the view's content to the clipboard
we should add the ability to copy the view's content to the clipboard (it may be useful for people to take a pic of the callgraph and show to other people, for example)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
private MethodWrapper fCalleeRoot;
    private MethodWrapper fCallerRoot;
    private IMemento fMemento;
    private IMethod fShownMethod;
    private SelectionProviderMediator fSelectionProviderMediator;
    private List fMethodHistory;
    private TableViewer fLocationViewer;
    private Menu fLocationContextMenu;
    private SashForm fHierarchyLocationSplitter;
    private SearchScopeActionGroup fSearchScopeActions;
    private ToggleOrientationAction[] fToggleOrientationActions;
    private ToggleCallModeAction[] fToggleCallModeActions;
    private ToggleImplementorsAction[] fToggleImplementorsActions;
    private CallHierarchyFiltersActionGroup fFiltersActionGroup;
    private HistoryDropDownAction fHistoryDropDownAction;
    private RefreshAction fRefreshAction;
    private OpenLocationAction fOpenLocationAction;
    private FocusOnSelectionAction fFocusOnSelectionAction;
    private CompositeActionGroup fActionGroups;
    private CallHierarchyViewer fCallHierarchyViewer;
    private boolean fShowCallDetails;
    public CallHierarchyViewPart() {
        super();
        fDialogSettings = JavaPlugin.getDefault().getDialogSettings();
        fMethodHistory = new ArrayList();
    }
    public void setFocus() {
        fPagebook.setFocus();
    }
    /**