Create minidump on fatal Win32 exceptions

Remove software exception translator function, simplifying exception handler
macros.  FatalSystemExceptions are left unhandled.

src/main.cpp

@@ -780,6 +780,8 @@ int main(int argc, char *argv[])
 {
 	int retval;
 
+	debug_set_exception_handler();
+
 	log_add_output_maxlev(&main_stderr_log_out, LMT_ACTION);
 	log_add_output_all_levs(&main_dstream_no_stderr_log_out);