Replace deprecated WidgetProperties and simplify klighd.ui.printing.dialog

[HannesWell]

This PR is split in two commits and has the goal to first simplify the classes in de.cau.cs.kieler.klighd.ui.printing.dialog and to replace the deprecated class org.eclipse.jface.databinding.swt.WidgetProperties, which is eventually removed in the Eclipse 2022-12 release.
The first commit addresses the first topic and the second one the second.

Please let me know if you prefer more fine grained PRs.

Edit: The deletion is done in eclipse-platform/eclipse.platform.ui@c44f8d7

[sailingKieler]

Thanks a lot @HannesWell for this contribution and taking care about this "non-first-class-citizen feature" of KLighD.

In general I'm a bit hesitant on changes like in 'ActionBlock.java', which is basically just a white space change, but in the context of the changes in the other files it definitely makes sense.

In what kind of project are you using KLighD?
Can you drop us an example of the diagrams you're creating?

Best regards and thanks again!

[sailingKieler]

I'll merge this together with #150.

[HannesWell]

You're

In general I'm a bit hesitant on changes like in 'ActionBlock.java', which is basically just a white space change, but in the context of the changes in the other files it definitely makes sense.

Yes I understand that, but like you, in the context of the other changes I came to the same conclusion that it made sense to unify that.

In what kind of project are you using KLighD? Can you drop us an example of the diagrams you're creating?

It is a software aimed for (mechanical, aerospace, ...) engineers to design complex systems and helps to automate the design of such systems.

Some screenshots are below. Unfortunately this is closed source so I cannot share that with you.
This required some adjustments in the code. A colleague of mine did that and therefore I don't have an exact overview of what and how much changed, nevertheless I would like to contribute those changes upstream in this repo. Would you, in general, welcome more contributions?