Make class selector dynamic

[stiber]

Right now, InputConfigClassSelectionDialog has hard-coded classes; instead, it should load that information from AllParamsClasses.xml

[pali-r]

Is this issue open to be assigned to someone? If yes, can I work on this?

[stiber]

Yes, after some consulting with our team, you are welcome to work on this. Feel free to fork the repo; when you create the pull request, it would be great if you could introduce yourself. You can request that @king-shak review your pull request. Please refer to our GitHub wiki pages for information about our project, including style guide and tools.

We haven't yet automated style and build checks (or written a CONTRIBUTING.md), though that will be coming in the not-too-distant future. Meanwhile, please be sure to check that your code builds and run checkstyle to make sure it passes our style requirements.

[pali-r]

Ok, thank you. I will start working on it.