Refactor weak beam widget

details

Ewoksify WeakBeamWidgetOW

behavior

Today the following actions are possible:

• click on apply: will compute the WeakBeam and display the result from the interface. The apply is launching a computing 'just' to provide a feedback to the user. So this part is not ewoksified and will stay as it is for now (using darfix OperationThread)
• click on ok: move to the next widget. Now this will call the darfix task 'WeakBeam'

hint

Tested with the following workflow:

note and also adding some widget link with the output.

Output of the original weak beam widget

issues

also requires workflow/ewoks/ewoksorange!169