Create "categories" at the community plugin level

[aalbino2]

@ka-sarthak and me were thinking about having some EntryData classes with a category already defined so we don't need to do this in the user plugins

@hampusnasstrom yet another discussion point 😏

[aalbino2]

Hey @ka-sarthak, @fabianschoeppach didn't find the solution classes, so putting them in a category becomes a more and more useful thing to do, for every EntryData in the plugin.

Let's keep this in mind

[ka-sarthak]

@aalbino2 Ah, sure. I will make a Solutions category for these classes. #106