redraw_rect

Iam going to remove redraw_rect from the container if noone objects :)
Basicly the concept of having a redraw rect in each container/widget is 
borked, it is only a transient value which has to be passed upwards to 
application when redraw is called, so the only object which needs to 
maintain a redraw rect is application, otherwise many things dont really 
work because for example if i call current_state->redraw(rect()); then 
the user expects that the whole state is redrawed, but in the children's 
redraw rects there is the information missing that a redraw is neccesary 
and so no redraw takes place (IMO this is what's happening in test app 
with sdl (no initial screen update)). The right way to do the screen 
updating would be simply to pass upwards the redraw rectangle on the 
stack, and only applications stores it. When Draw is called, the drawing 
routines will get the redraw rectangle as the cliprect parameter and 
decide for themselfes if redrawing is necessary, without using local state.