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.Manager/ModpackInstaller.cs

@@ -153,7 +153,7 @@ public class ModpackInstaller(ModpackConfig updateConfig, ModpackInfo modpackInf
 
         foreach (InstallAction iaction in checkResult.Actions)
         {
-            var destFilePath = Path.Combine(modpackInfo.LocaLPath, iaction.DestPath);
+            var destFilePath = iaction.GetDestPath(modpackInfo.LocaLPath);
             var sourceUrl = updateConfig.PreferDirectLinks && !string.IsNullOrWhiteSpace(iaction.SourceUrl)
                    ? iaction.GetSourceUrl(checkResult.LatestVersion, overwriteVersion: OverwriteVersion)
                    : await factory.ResolveSourceUrl(iaction, targetVersion: checkResult.LatestVersion, overwriteVersion: OverwriteVersion);