Add Campaign Animation Set editor - #384

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v2, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'container' in 'void PackFileService.AddFilesToPack(IPackFileContainer container, List<NewPackFileEntry> newFiles)'.

Dereference of a possibly null reference.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Non-nullable field 'OnItemSelected' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field 'OnItemDoubleClicked' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Cannot convert null literal to non-nullable reference type.

Non-nullable field '_name' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable property 'Matrix' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Cannot convert null literal to non-nullable reference type.