New 3.0.0 feature: getting public buddy alias while adding to blist

[Tomasz Wasilczyk]

Sorry, the message was sent too early. Corrected proposal is here:

typedef void (*PurpleGetBuddyPublicAliasSuccessCallback)(const char
*alias, gpointer user_data);
typedef void (*PurpleGetBuddyPublicAliasFailureCallback)(const char
*error, gpointer user_data);

struct _PurplePluginProtocolInfo
{
    ....
    void (*get_buddy_public_alias)(PurpleConnection *gc, const char
*who, PurpleGetBuddyPublicAliasSuccessCallback success_cb,
PurpleGetBuddyPublicAliasFailureCallback failure_cb, gpointer
user_data);
}