C#: Add change note

Author: hvitved

change-notes/1.25/analysis-csharp.md

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+# Improvements to C# analysis
+
+The following changes in version 1.25 affect C# analysis in all applications.
+
+## New queries
+
+| **Query**                   | **Tags**  | **Purpose**                                                        |
+|-----------------------------|-----------|--------------------------------------------------------------------|
+
+
+## Changes to existing queries
+
+| **Query**                    | **Expected impact**    | **Change**                        |
+|------------------------------|------------------------|-----------------------------------|
+
+
+## Removal of old queries
+
+## Changes to code extraction
+
+## Changes to libraries
+
+* The class `UnboundGeneric` has been refined to only be those declarations that actually
+  have type parameters. This means that non-generic nested types inside construced types,
+  such as `A<int>.B`, no longer are considered unbound generics. (Such nested types do,
+  however, still have relevant `.getSourceDeclaration()`s, for example `A<>.B`.)
+
+## Changes to autobuilder