ProjectSettingsを.unitypackage形式で出力

ExportPackage.cs

using System;
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Linq;

namespace EditorUtility
{
    static class ExportProjectSettings
    {
        /// <summary>
        /// ProjectSettingsを.unitypackage形式で出力
        /// </summary>
        [MenuItem("Editor Utility/Export ProjectSettings")]
        static void Export()
        {
            const string ExportPath = "ExportedProjectSettings.unitypackage";

            // "(Project Directory)/ProjectSettings"のパスを取得
            var dataPath = Application.dataPath;
            var lastSlashIndex = dataPath.LastIndexOf("/", StringComparison.Ordinal);
            dataPath = dataPath.Substring(0, lastSlashIndex + 1);
            dataPath += "ProjectSettings/";

            // ProjectSettings以下にあるファイルをかき集める
            var directoryInfo = new DirectoryInfo(dataPath);
            var fileInfos = directoryInfo.GetFiles("*", SearchOption.AllDirectories);
            var files = fileInfos.Select(_ => "ProjectSettings/" + _.Name).ToArray();

            // 出力
            AssetDatabase.ExportPackage(files, ExportPath,
                ExportPackageOptions.Interactive | ExportPackageOptions.Recurse);
        }
    }
}