Possible fix for white text issue

1) In both types of cells, make the text field both non editable and non selectable.
2) Implement a new context menu option for Projects “Rename Project”
3) Implement renameProject: - this gets the cell view from the projectSourceList, sets the textField to editable, then starts editing the cell
4) After editing is complete, make the cell non editable again
5) Remove unneeded outlineView:shouldEditTableColumn:item — this is only used for cell based NSOutlineViews