Implements IAutoComplete and IAutoComplete2 interfaces

[Maxime Bellengé]

This patch implements the main aspects of the IAutoComplete and
IAutoComplete2 interfaces. It enables to have auto completion with some
apps such as emule. Not all the styles are implemented yet, they will
follow in a future patch.

a+

Max

ChangeLog:
        * Implements the ACO_AUTOSUGGEST, ACO_AUTOAPPEND,
ACO_UPDOWNKEYDROPSLIST styles. 

-- 
Maxime Bellengé <maxime.bellenge at laposte.net>
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