Improve FCP field naming of trust/score stuff:
- Instead of "Value0" use "Trust.0.Value". Do this to all trust fields
- Instead of "Amount" use "Trust.Amount"
- Specify the amount when sending only a single trust/score
- Also adapt the parsers & the unit tests so the unit tests may succeed. The will not do so yet because they will expect "Identities.0.Amount" but the identity API is not adapted by this commit yet. It is structurally different to the trust/score part so it will receive a different commit
- Notice: This API is not present on master, it was added in event-notifications, so we only change it here.