chore: repo cleanup and code quality improvements

- Remove global.json (SDK pinning unnecessary)

- Remove nuget.config, move MyGet source to .csproj RestoreAdditionalProjectSources

- Gitignore ndepend/ entirely, move badges to docs/img/

- Update README.md and docs/ndepend.md badge paths

- Add NDepend project property to QuanTAlib.slnx

- Expand .editorconfig ReSharper/diagnostic suppressions

- Use ArgumentOutOfRangeException instead of ArgumentException

- Use discard _ for unused event sender parameters

- Remove quantalib.code-workspace and sonar-suppressions.json

- Add filter signature SVGs

lib/channels/vwapsd/Vwapsd.Quantower.cs

@@ -58,18 +58,6 @@ public class VwapsdIndicator : Indicator, IWatchlistIndicator
         base.OnInit();
     }
 
-    private void UpdateSeriesNames()
-    {
-        if (UpperSeries != null)
-        {
-            UpperSeries.Name = $"Upper (+{NumDevs:F1}σ)";
-        }
-        if (LowerSeries != null)
-        {
-            LowerSeries.Name = $"Lower (-{NumDevs:F1}σ)";
-        }
-    }
-
     protected override void OnUpdate(UpdateArgs args)
     {
         var item = HistoricalData[0, SeekOriginHistory.End];