[Freeciv-Dev] (PR#3623) new window/dialog code

["Rafa³ Bursig" <bursig@xxxxxxxxx>]

Hi All

   This is secound revolution/mess/useless/... code patch and contains :

        WINDOW WIDGED MENAGMENT SYSTEM (window menager)

This is last puzzel to basic MDI in SDLClient. Idea is simple, each 
window/dialog has own buffer layer ( size of screen ) which is draw in 
screen with flush operations. This code consume lots of memory but is 
extremly effecive.

Implementation :
Each widget get "dst" parm. which define destination buffer layer and 
is set during creation of this widget. Only "create_window(...)" 
fuction can allocate new buffers, rest of create widgets functions must 
get existing "dst" buffers. Popdown_dialogs function will free "dst" 
buffers.

This patch is big ( again ) becouse it change GUI widget API.

This code have additional some fixes and cleans + drawing goto/patrol 
lines.

I plan commit it tomorow then any critic will be welcome :)

Rafal

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