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/imgui_nvrhi.cpp

@@ -53,6 +53,9 @@ SOFTWARE.
 #include "imgui_nvrhi.h"
 #include "nvrendererbackend.h"
 #include "config.h"
+#include <cstdint>
+#include <cstdio>
+#include <cstring>
 
 struct VERTEX_CONSTANT_BUFFER
 {