[crossfire] Player knowledge management

[Nicolas Weeger]

Hello.


I just committed the framework for player knowledge management.

For now it only tracks alchemy formulas, but it shouldn't be hard (or I made a 
design mistake!) to extend to monsters, and other information thought to be 
relevant to track.


This commit introduces the new 'knowledge' command, which with a 'list' 
parameter lists all known knowledge items, and 'show <number>' displays 
details of the item.


No more wondering what ingredients are needed for a formula, as long as you 
found it ingame :)


Enjoy.

Nicolas
-- 
http://nicolas.weeger.org [Mon p'tit coin du web]
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