Allow freeform fields to be replaced with text

[benzea]

Sometimes people are afraid that handwriting can be recognized by people reading the report. In cases like this it makes sense to manually convert the images into text.

There are different parts to this:

• Report generation
• Options to prefer the replacement text/images and hide the other one even if one of them is missing.
• Possibility to input text in the GUI interface.

The second one is probably hardest. This is probably something where a question based mode (issue #13) would make a lot of sense.

[benzea]

The widget_view branch is a first step. In the branch the GUI has the same data as on the left represented in GTK+ widgets.

Using this, it is now easily possible to add text entries and store the data.