[CLEANUP] Split settings view controller

[treh]

We currently instantiate it in three different contexts, and in each of them 2/3 of the outlets are not connected.

And one more thing: If I look at the log, we might be better off to use rebase merges. They need to be configured for the repository though.

[ckrey]

@selphiron as the repository owner. Please consider enabling rebase merges as suggested by @treh above https://docs.github.com/en/github/administering-a-repository/configuring-commit-rebasing-for-pull-requests