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

docs/img/methods.svg

@@ -0,0 +1,22 @@
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+    xmlns:xlink='http://www.w3.org/1999/xlink' width='111.40234' height='20' role='img' aria-label='languages: 5'>
+    <title># Methods: 14666</title>
+    <linearGradient id='s' x2='0' y2='100%'>
+        <stop offset='0' stop-color='#bbb' stop-opacity='.1'/>
+        <stop offset='1' stop-opacity='.1'/>
+    </linearGradient>
+    <clipPath id='r'>
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+    <g clip-path='url(#r)'>
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+        <rect width='111.40234' height='20' fill='url(#s)'/>
+    </g>
+    <g fill='#FFF' text-anchor='center' font-family='Verdana,Geneva,DejaVu Sans,sans-serif' text-rendering='geometricPrecision' font-size='110'>
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+        <text x='40' y='140' transform='scale(.1)' fill='#FFF' textLength='560.33203'># Methods</text>
+        <text aria-hidden='true' x='700.33203' y='150' fill='#010101' fill-opacity='.3' transform='scale(.1)' textLength='333.6914'>14666</text>
+        <text x='700.33203' y='140' transform='scale(.1)' fill='#FFF' textLength='333.6914'>14666</text>
+    </g>
+</svg>