T1002049 new refactoring menu

This refactors the refactorings and changes also their command IDs to match the new package structure. The problem with this is that all user defined preferences are lost - I didn't find a way to auto migrate the preferences. Therefore I created a migration manager which seems to work fine as far as I could look.

I would like to know if you assist the changes of the command IDs + the way how the migration manager works.