Rename, Move class to file, Rename file, Extract interface class context menu items from SharpDevelop to SharpRefactoring.addin.
Added comments to MenuBuilders about Addin tree paths where they are registered, for better clarity on how the menu builders work.
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@6126 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61