refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/ClearStashes.cs

@@ -0,0 +1,21 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class ClearStashes : Popup {
+        public ClearStashes(Repository repo) {
+            _repo = repo;
+            View = new Views.ClearStashes() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                new Commands.Stash(_repo.FullPath).Clear();
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}