Implemented window sizing (and re-sizing) by draggin window edges.

Unfinished, more work needed in:
* command-line arguments (grafx2 myimage.pcx -width 640 -height 480)
* querying SDL for best modes
* detecting bad modes and recovering (though shift+return restores to window)
* saving settings in gfx2.ini.
Also, now the window's close button triggers Quit. Both events (quit, resize)
are only taken into account when all menus are closed.


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@188 416bcca6-2ee7-4201-b75f-2eb2f807beb1

sdlscreen.h

@@ -25,6 +25,7 @@
   void Display_brush_Mono_zoom_SDL (word Pos_X,word Pos_Y,word Decalage_X,word Decalage_Y,word Largeur,word Pos_Y_Fin,byte Couleur_de_transparence,byte Couleur,word Largeur_brosse,byte * Buffer);
   void Clear_brush_zoom_SDL        (word Pos_X,word Pos_Y,word Decalage_X,word Decalage_Y,word Largeur,word Pos_Y_Fin,byte Couleur_de_transparence,word Largeur_image,byte * Buffer);
   void Set_Mode_SDL();
+  void Gere_Evenement_SDL(SDL_Event * event);
 
   SDL_Rect ** Liste_Modes_Videos_SDL;
   byte* Ecran;