MemberAdminWindow: Add pending member movement export

Elwig/Helpers/Export/IExporter.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace Elwig.Helpers.Export {
-    public interface IExporter<T> : IDisposable, IAsyncDisposable {
+    public interface IExporter<T> : IDisposable {
         /// <summary>
         /// The default file extension of the exported files to be used (whithout a preceding ".")
         /// </summary>
@@ -14,7 +14,9 @@ namespace Elwig.Helpers.Export {
         /// </summary>
         /// <param name="data">The data to be exported</param>
         /// <param name="progress">The progress object to report to</param>
-        void Export(IEnumerable<T> data, IProgress<double>? progress = null);
+        void Export(IEnumerable<T> data, IProgress<double>? progress = null) {
+             ExportAsync(data, progress).GetAwaiter().GetResult();
+        }
 
         /// <summary>
         /// Asynchronosly export the given data to the given file.