Started work to support per monitor DPI. Using DPI to scale tiles

appropriately.

Renamed ntassert to nhassert.  (Naming mistake caused by using ntassert
at work).

Re-ordered a few more includes to get window headers included before
nethack headers.

sys/winnt/winnt.c

@@ -468,8 +468,8 @@ char *buf;
 }
 #endif /* RUNTIME_PORT_ID */
 
-/* ntassert_failed is called when an ntassert's condition is false */
-void ntassert_failed(const char * exp, const char * file, int line)
+/* nhassert_failed is called when an nhassert's condition is false */
+void nhassert_failed(const char * exp, const char * file, int line)
 {
     char message[128];
     _snprintf(message, sizeof(message),