The original code has been written by WoltLab GmbH. This package brings back the feature to import and export the options (only options!) directly from your ACP, which has been removed with WSC 3.0.0.
removal commit and source for the whole code within this repository: https://github.com/WoltLab/WCF/commit/922f654939ef6dc834a678b0ee56e0c045cbdf12