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

ndepend/NDBadge.runtimeconfig.json

@@ -1,13 +0,0 @@
-{
-  "runtimeOptions": {
-    "tfm": "net10.0",
-    "framework": {
-      "name": "Microsoft.NETCore.App",
-      "version": "10.0.0"
-    },
-    "configProperties": {
-      "System.Reflection.Metadata.MetadataUpdater.IsSupported": false,
-      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
-    }
-  }
-}