Config Validator

I am running into several issues during a large import.
Some of these are documented (hardlink vs others), some of these are not (scrubbing, changing tags for existing elements during import of another element)

### Proposed solution

Validate the Config against a known-issues document and raise alerts for incompatible / problematic setting combinations.

### Objective

Ensure config is reasonable and doesnt lead to issues

#### Goals

Stability of Product, Improved UX (less duration during import)

#### Non-goals

#### Anti-goals

Valid but not adviced config settings could fail => `-f --force-config` flag is required