Feature request: Add federation approach

[tschmidtb51]

I have the vision that VINCE should be federated. This would help to transport/share information between different VINCE instances (of different countries) - especially in joined cases. (Just think about the coordination group in AMNESIA:33.) Moreover, it could limit the amount of accounts a single user (vendor/researcher/...) needs to have to run the cases.

The default should be that the case is only available at the instance it was created on. (This also helps to limit the risk for each single instance as none has all cases and helps to fulfill gov requirements to store data in your own country.) However, other coordinators can be added, which basically (copies and) syncs the case with their VINCE instance.

Thoughts?

[ahouseholder]

We're looking into this within the context of our work on Vultron.

[tschmidtb51]

I like the idea but I'm not sure whether this is currently sufficient for all use cases (see also in combination: #98).