manager: allow parent path annotations

- Allows unlimited amount of `..\` or `../` at the start of DestPath string.
- Each of then will go back one folder.
- Similar to how Linux works or Visual Studio project styles.
- This allows us to install/update lwjgl3ify in PrismLauncher.

ModpackUpdater.Apps.Manager/Ui/UpdatesCollectorUi.cs

@@ -42,6 +42,12 @@ public partial class UpdatesCollectorUi : RadForm
         {
             var updates = await factory.FindUpdates(action, workspace.ModpackConfig?.MinecraftVersion, workspace.ModpackConfig?.ModLoader ?? ModLoader.Any);
 
+            BeginInvoke(() =>
+            {
+                radProgressBar1.Value1 += 1;
+                radProgressBar1.Text = $"{radProgressBar1.Value1} / {radProgressBar1.Maximum}";
+            });
+
             if (updates == null || updates.Length == 0 || updates[0].Value == action.SourceTag)
                 continue;
 
@@ -96,8 +102,15 @@ public partial class UpdatesCollectorUi : RadForm
     private async void UpdatesCollectorUi_Shown(object sender, EventArgs e)
     {
         radWaitingBar1.StartWaiting();
+        radProgressBar1.Value1 = 0;
+        radProgressBar1.Maximum = actions.Length;
+        radProgressBar1.Text = null;
+        radProgressBar1.Visible = true;
+
         CurrentUpdates = await FindUpdates();
         LoadUpdates(CurrentUpdates);
+
+        radProgressBar1.Visible = false;
         radWaitingBar1.StopWaiting();
     }