feat (AutoCompleteQuests): make a lot of quests easier to complete

When you just complete a quest asking you to kill x monsters or to loot x items, the quest giver is temporarily summoned right in front of you, so you can complete the quest (and eventually pick up the next quest) without needing to go back to the NPC location.
fix (AutoCompleteQuests): compatibility fix for rev 55.
Merge remote-tracking branch 'origin/AutoCompleteQuests' into master2

Conflicts:
	src/server/game/World/World.cpp