jface.snippets.Snippet040 : CellEditor is forward referenced when looking for 'LayoutData'

[Frank Benoit]

Thank you, yidaby.

I added your snippets
http://www.dsource.org/projects/dwt-samples/browser/jface/snippets/Snippet040TableViewerSorting.d?rev=88%3A9ed020f0c2a5

And to workaround the forward reference problem, i changed the CellEditor.
http://www.dsource.org/projects/dwt-addons/changeset/69%3A07b9d96fd764

Then i also added the compareToIgnoreCase to dwt-win/dwt-linux 
dwt.dwthelper.utils

There are a lot of problems with anonymous and nested classes in DMD. 
This is why i did move all those classes to top level scope.

It seems works now. I tested it on linux.