Load new qualification sets

[jeriox]

As a manager, I want to manage the qualifications that are available. Currently this can be done by loading predefined qualification sets (at the moment one with medical and drivers license and one with DLRG and radio) with the setupdata management command. This is really unflexible and unsuitable, especially when even more datasets are added via #78 that share common qualifications.

I expect the system to have views to load the predefined sets from the ephios homepage. Qualifications that already exist (identified by UUID) should not be overwritten, but new ones in the dataset should be added. I can choose whether I want to import the dependencies between the qualifications as well.

I also expect to have CRUD views to manage my own qualifications. When editing a predefined consequence I expect the system to display a warning telling me about the impact of my action (considering interoperability in federation).