#358 lootdrop table needs a flag to restrict an item from dropping/being visable if a quest has been completed

example: lore and legend items have been changed to only drop when you have not completed the quest however if you are in a group the item still drops but it isnt visable and populates a message that says something like there are no items that you can loot. and if no group the items do not drop at all

Loot is added on Spawn, so we would have to remove items already added in the loot. Also having specialized behavior per group member in the loot window sounds horrible lol