Add new boss quest - raise the Lich and destroy her!

Added a new quest to raise the Lich using blood of the innocent, at which point the player(s) will have to fight her. She summons monsters at 4 points during the quest, 2x monster for each player in the first 3 summons (zombie, tusked, daemon skeleton) and a single dark angel for the fourth summon. During the period where her minions are alive, the Lich can't be attacked and won't attack or cast spells.

Loot table still needs to be updated for Lich and dark angel.