Cleared issue in a few scripts which would be trying to access Java Math library methods with unexpected parameter types.
Fixed EllinPQ rewarder NPC handing out an unexpected itemid to the player.
Cleared SQL foreign key constraint statement no longer supposed to be used.
Made NPCs now work properly on multiworld system. Solved multiple issues
regarding Player Shops not giving back items properly when owner exits.
Added restriction on changing channels at FM rooms, preventing shop
owner entering Cash Shop.
