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/QuanTAlib.Tests.csproj

@@ -8,6 +8,7 @@
     <IsTestProject>true</IsTestProject>
     <NoWarn>$(NoWarn);CS8892</NoWarn>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+    <RestoreAdditionalProjectSources>https://www.myget.org/F/ooplesfinance_stockindicators/api/v3/index.json</RestoreAdditionalProjectSources>
   </PropertyGroup>
 
   <ItemGroup>