C#: Convert 1.26 change notes

csharp/change-notes/2020-08-18-ast-viewer.md

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+tooling
+* The Abstract Syntax Tree of C# files can be viewed in Visual Studio Code.

csharp/change-notes/2020-08-18-partial-method-bodies.md

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+lgtm,codescanning
+* Partial method bodies are extracted. Previously, partial method bodies were skipped.

csharp/change-notes/2020-08-26-implicit-array-lengths.md

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+lgtm,codescanning
+* Inferring the lengths of implicitely sized arrays is fixed. Previously, multi
+  dimensional arrays were always extracted with the same length for each dimension.
+  With the fix, the array sizes `2` and `1` are extracted for `new int[,]{{1},{2}}`.
+  Previously `2` and `2` were extracted.

csharp/change-notes/2020-09-02-assembly-insensitive-trap.md

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+lgtm,codescanning
+* The extractor is now assembly-insensitive by default. This means that two entities
+  with the same fully-qualified name are now mapped to the same entity in the resulting
+  database, regardless of whether they belong to different assemblies. Assembly
+  sensitivity can be reenabled by passing `--assemblysensitivetrap` to the extractor.

csharp/change-notes/2020-09-22-weak-encryption.md

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+lgtm,codescanning
+* The required key size for the query "Weak encryption: Insufficient key size" has been increased from 1024 to 2048.