[ASDAlexander77]

Fixes two tsbindgen gaps found while generating NVRHI's bindings in native_ts_graphics.

Nullable pointers

A pointer parameter or struct field is now T | null — Opaque, Reference<T>, a @cpp class, string, a function pointer. C lets these be null (an optional out-parameter, queryFeatureSupport(f, null, 0), a desc's unused buffer). tslang lowers T | null to the same pointer (checked: call arguments and tuple sizes are unchanged). A C++ reference stays non-null, and so does a result, so call sites aren't forced into null checks.

C++ structs in namespaces

• A struct in a namespace or nested in a class (nvrhi::Color, nvrhi::TextureSubresourceSet) is declared under its own name, keyed by its qualified name; --filter matches either.
• A C++ struct with constructors, methods or member initializers is a tuple when its fields are where a tuple's are. A polymorphic or derived one, or one with a field tsbindgen can't spell (std::string, a container, an array, a bitfield), is type X = Opaque; with the reason in a // skipped: line.
• Of two structs of one name in different namespaces, the second is named with its namespaces, minus --namespace (rt_Desc), with a warning.
• Templates, their specializations (including one only named, which is TSK_Undeclared), classes inside them, local classes and lambdas still get no declaration: a pointer to one stays a plain Opaque /* C++ type */.

Visible change: a field-less class in the main file now prints // skipped: Widget — empty struct / type Widget = Opaque; where it used to be silent (README example updated).

Tests

• New unittests/TsClangImporter/NamespacedStructTest.cpp; pointer expectations in the existing unit tests updated — 67/67 pass.
• test-bindgen-cpp: the fixture gains fx::Extent (a namespaced struct with a constructor) and Shape::fits(const Extent &, const Extent *), called from TS with a reference, a pointer and null against real compiled C++ (exe and JIT).
• ctest -R "test-bindgen|cppvtable|cpp_slot": 46/46 on Windows.
• Stress: NVRHI (MSVC, Android x86_64 + aarch64), the whole MSVC STL and libc++ with --filter 'std::*', windows.h + d3d12.h — no crash, and the output compiles with tslang.

Downstream

native_ts_graphics#52 (merged) already accepts this output in tools/gen_nvrhi_classes.py; its NVRHI tests pass with this tsbindgen on Windows and Android.

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