Re-evaluate the package-lock.json

[thinkh]

Coming from PR #164, we saw that the package-lock.json in all packages except core are still using the lockfileVersion: 1 (while core is already using lockfileVersion: 2). Hence, the package-lock.json for the other packages might be outdated and needs an update.

Please evaluate if we need them at all and/or if we can remove the independent package versions in the lerna.json file:

https://github.com/ffg-seva/visahoi/blob/dc79c74db66dec7556ed1b0e6adc53b2763f6282/lerna.json#L5

Then all packages would have the same version, as it was done with the last release 3.0.0.