Additional managers for handling content

I have create extension build-in|stand-alone for SC.

1. Resource selector
   In Procedure Browser anyone can find gimp-brushes-get-list, gimp-gradients-get-list, etc.
   This procedures retrieve list of available resource after gimp showed successfully.
   I add this opportunity to put name of chosen resource in SF-STRING type field.
2. Label editor
   If you fired script after build process. You can see sometimes labels from different language. With this wizard you can named them by own scheme.
3. Project holder
   With this extension you can engineering your Script-Fu as long as you have will.