Function used in mission creation.
name: Action name, only used by the mission designer.
npc_name (Optional): Giver NPC tag name.
group (Boolean): Allows to give items to the whole group at the same time.
Item/quantity/quality: Array containing given item description. See item_guidelines for the formatting requirements.
guild (Boolean): This parameter is only for guild missions. If it is set to true the action is done for the guild (not for the players that completed the mission).
npc_name (bot): $b$
item_type (item): $i$
item_quantity (int): $qt$
item_quality (int): $qual$