Refactor: Cycles: Automated clang-tidy fixups in Cycles

* Use .empty() and .data()
* Use nullptr instead of 0
* No else after return
* Simple class member initialization
* Add override for virtual methods
* Include C++ instead of C headers
* Remove some unused includes
* Use default constructors
* Always use braces
* Consistent names in definition and declaration
* Change typedef to using

Pull Request: https://projects.blender.org/blender/blender/pulls/132361

intern/cycles/hydra/render_buffer.cpp

@@ -14,7 +14,7 @@ HDCYCLES_NAMESPACE_OPEN_SCOPE
 
 HdCyclesRenderBuffer::HdCyclesRenderBuffer(const SdfPath &bprimId) : HdRenderBuffer(bprimId) {}
 
-HdCyclesRenderBuffer::~HdCyclesRenderBuffer() {}
+HdCyclesRenderBuffer::~HdCyclesRenderBuffer() = default;
 
 void HdCyclesRenderBuffer::Finalize(HdRenderParam *renderParam)
 {