Edit sketch button above "unlink" button when editing a feature (extrude, revolve, etc)

[Chris3]

The idea is to create an edit external sktech button above the "unlink" button. This way, when you forget that geometry is driven by external sketches rather than internal sketches, you can jump into editing the sketch directly from the feature editing dialog rather then having to find it in the tree yourself.

[T_F]

I would also add the possibility to make internal and external sketch. Today if we create an internal sketch it always will be internal, the same for external sketch.