Release preparation for version 2.17.0

cpp/ql/src/change-notes/released/0.9.9.md

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+## 0.9.9
+
+### New Queries
+
+* Added a new query, `cpp/type-confusion`, to detect casts to invalid types.
+
+### Query Metadata Changes
+
+* `@precision medium` metadata was added to the `cpp/boost/tls-settings-misconfiguration` and `cpp/boost/use-of-deprecated-hardcoded-security-protocol` queries, and these queries are now included in the security-extended suite. The `@name` metadata of these queries were also updated.
+
+### Minor Analysis Improvements
+
+* The "Missing return-value check for a 'scanf'-like function" query (`cpp/missing-check-scanf`) has been converted to a `path-problem` query.
+* The "Potentially uninitialized local variable" query (`cpp/uninitialized-local`) has been converted to a `path-problem` query.
+* Added models for `GLib` allocation and deallocation functions.