[crossfire] Quests, continued

[Nicolas Weeger]

Hello.

I'm not totally satisfied of my quest implementation. It's not general
enough for many things we could think of, and there are some drawbacks
(like removing all markers on completion).

Therefore I suggest we don't use that for now, and think of everything
we'd want to be able to do.

What I can think of (some stolen from Daimonin):
* kill a monster
* collect n items of something
* go someplace
* get an item (from a chest/monster) only if doing quest

Granted this can be done with plugins, but i'd say we should implement
that as part of server itself.

Ryo