repair the include reordering

The previous pass dropped imports into the middle of HR_RETURN's
line continuations, breaking nvrenderer_d3d12.cpp, and its scan gave up
on the first line of any file with a BOM - which is why nvtexture.cpp
still had five includes sitting after its imports. Rewritten to skip
macro continuations, tolerate a BOM, and insert only immediately before
the first import.

betterRenderer/renderer/source/nvrenderer_d3d12.cpp

@@ -17,9 +17,10 @@
 
 #include "nvrendererbackend.h"
 
-#define HR_RETURN(op)                                      \
 import eu07.utilities.globals;
 import eu07.utilities.logs;
+
+#define HR_RETURN(op)                                      \
   hr = (HRESULT)(op);                                      \
   if (FAILED(hr)) {                                        \
     ErrorLog(fmt::format(#op " returned HRESULT={}", hr)); \