include what you use in betterRenderer

Its sources reached the standard library through the project headers they
included; those are imports now. 178 headers across 56 files, plus 18 C
library headers elsewhere for memcpy/printf and friends. MSVC's STL does
not supply these transitively the way libstdc++ does.

betterRenderer/renderer/source/environment.h

@@ -3,6 +3,10 @@
 #include "fullscreenpass.h"
 #include "nvrenderer/resource_registry.h"
 #include "nvrhi/nvrhi.h"
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <string>
 
 struct MaEnvironment : public MaResourceRegistry {
   nvrhi::TextureHandle m_skybox;