Add WSModel and VariantMeshDefinition support to glTF/GLB export - #388

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 'file' in 'IEditorInterface OpenEditorCommand.Execute(PackFile file, EditorEnums? preferedEditor = null)'.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Cannot convert null literal to non-nullable reference type.