[crossfire] Client display logic rewrite

[Alex Schultz]

Nicolas Weeger wrote:

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     What should I do here?
     
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     a) fix the documentation (map_scroll implicitly clears out of map bounds
     
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        information), or
     
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     You got my vote on that one too.
     
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     I agree as well. That misdocumentation took me a while to figure that 
out when coding the crossfire python-based bot I'm currently making. 
(which I'm thinking of scrapping most of in favor of creating a C 
extension for python that links to the common/ files)

    Alex Schultz