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/oscillators/er/Er.cs

@@ -73,8 +73,6 @@ public sealed class Er : AbstractBase
     /// Period of the indicator.
     /// </summary>
     public int Period => _period;
-
-    /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public override TValue Update(TValue input, bool isNew = true)
     {
@@ -141,8 +139,6 @@ public sealed class Er : AbstractBase
         PubEvent(Last, isNew);
         return Last;
     }
-
-    /// <inheritdoc/>
     public override TSeries Update(TSeries source)
     {
         int len = source.Count;
@@ -164,8 +160,6 @@ public sealed class Er : AbstractBase
 
         return new TSeries(t, v);
     }
-
-    /// <inheritdoc/>
     public override void Prime(ReadOnlySpan<double> source, TimeSpan? step = null)
     {
         TimeSpan interval = step ?? TimeSpan.FromTicks(1);
@@ -175,8 +169,6 @@ public sealed class Er : AbstractBase
             Update(new TValue(baseTime + (interval * i), source[i]), isNew: true);
         }
     }
-
-    /// <inheritdoc/>
     public override void Reset()
     {
         _closeBuf.Clear();