message: export-gltf ignores elements in private models
  Elements in private models are not intended for display or graphical
  export.
diff: @@ -437,8 +437,8 @@ const exportGltfArgs: yargs.Arguments<ExportGltfArgs> = yargs
  GltfGlobals.initialize(exportGltfArgs.input, exportGltfArgs.output);
  const elementIdArray: Id64Array = [];
  - // Get all 3D elements that aren't part of template definitions.
  - const sql = "SELECT e.ECInstanceId FROM bis.GeometricElement3d e JOIN bis.Model m ON e.Model.Id=m.ECInstanceId WHERE m.isTemplate=false";
  + // Get all 3D elements that aren't part of template definitions or in private models.
  + const sql = "SELECT e.ECInstanceId FROM bis.GeometricElement3d e JOIN bis.Model m ON e.Model.Id=m.ECInstanceId WHERE m.isTemplate=false AND m.isPrivate=false";
  GltfGlobals.iModel.withPreparedStatement(sql, (stmt: ECSqlStatement) => {
  while (stmt.step() === DbResult.BE_SQLITE_ROW)
  elementIdArray.push(stmt.getValue(0).getId());
  