Putting ballots in separate memory

[ineiti]

This PR separates the ballots from the forms. This allows to run adding a new ballot much faster. When there are more than 100 ballots, this gets very important: adding a 1000th ballot can take 1s, a 10'000th ballot 10s.

Using this PR, up to the 10'000th ballot it only takes 100ms.

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[ineiti]

I think the tests/json/evoting/forms/openNoVotes.json got into the mix by mistake, have you rebased your branch on the current main?

True - late night git issue debugging. I was confused where this file comes from and was under the impression it was in the latest main... Deleted now.