Update modules/highgui/src/window.cpp

Reading of configuration for initial window pos+size added

Example:

<Wnd1>
   "ColorImg"
   "CV_WINDOW_NORMAL 650,25 700*600"
   "$Label JPGQ:"
   "$StatusLine xy RGB WidthHeight Viewport Zoom"
   "$applyLanguage"
 </Wnd1>