Improved default selection in "Go to" dialog.
SharpDevelop.Dom: Renamed IDecoration->IEntity, moved common properties in IClass and IMember into IEntity.
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2931 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61