Split Geocoding into two widgets

[janezd]

The current widget does two separate jobs. This is most obvious if you consider that when you put into a certain workflow, you would never switch from coding to encoding -- only one makes sense in a particular workflow.

I think we should split it into two widgets. Only coding would have the right part (replacements), and it would be put at the bottom, resulting in a nicer layout.

To avoid incompatibility, the current widget would be "invisible" and would appear for old workflows only -- in a similar way that was done in Table when we eliminated multiple inputs.