message: improve screenshot tool of event display to add numbers to screenshot files and do not overwrite the file
diff: @@ -1244,7 +1244,10 @@ void HandleKeyRelease(int wParam)
  else if (wParam == 'T')
  {
  printf("Taking Screenshot\n");
  - DoScreenshot("screenshot.bmp", screenshot_scale);
  + static int nScreenshot = 1;
  + char fname[32];
  + sprintf(fname, "screenshot%d.bmp", nScreenshot++);
  + DoScreenshot(fname, screenshot_scale);
  }
  else if (wParam == 'O')
  {
  