New: Added delegate tableView:willRemoveView:forTableColumn:row

Added delegate tableView:willRemoveView:forTableColumn:row in CPTableView
New: added delegate outlineView:willRemoveView:forTableColumn:item: in CPOUtlineView
Merge pull request #2100 from Dogild/TableViewWillRemoveView

New: Added delegate tableView:willRemoveView:forTableColumn:row