Fix initialization using injection context for complex objects

[tobiasdiez]

In order to help @Siedlerchr, I fixed a bug in the framework which we use to inject dependencies in the javafx controller. I proposed a PR AdamBien/afterburner.fx#80 but as he is a bit slow with integrating fixes, I think we should directly include the fix in JabRef for the moment (and remove it as soon as a new version of afterburner.fx with the fix is released).

• Change in CHANGELOG.md described
• Tests created for changes
• Screenshots added (for bigger UI changes)
• Manually tested changed features in running JabRef
• Check documentation status (Issue created for outdated help page at help.jabref.org?)
• If you changed the localization: Did you run gradle localizationUpdate?

[Siedlerchr]

Why don't we create a fork of the original project and include other fixes as well, e.g. the system errr output (there is already a Pr regarding that)
@JabRef/developers WDYT about this, forking the original code and maintaining it

[lenhard]

The problem here is the license. We cannot just copy the code and use it here, because it is licensed differently. We will need to go for a fork / separate library.

@koppor will contact the author of afterburner per mail. Maybe this wakes him up.

[tobiasdiez]

I really like license problems :-). I would actually help Adam Bien to maintain this library. I think, of now JabRef is one of the main users of afterburner and thus we should be interested in having a stable and working platform. (I don't like a separate fork).