Cleanups in base.Logic
* Use regular kwargs instead of **kwargs
* Fold getKeyNameFromFields into _keyName
* Fold getIfFields into getFromFieldsOr404
* Rename getKeyValues to getKeyValuesFromEntity
* Rename getKeyFieldsFromDict to getKeyFieldsFromFields
* Rename getFromFieldsOr404 to getFromKeyFieldsOr404
* Rename getKeyValues to getKeyValuesFromEntity
Patch by: Sverre Rabbelier
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