General rule :
This system allows you to define loot tables for a npc without creating a new loot table sheet. A custom loot table has to contain custom_loot_sets.
The custom loot tables are loaded and unloaded along with the primitive which contains them.
drop_proba : drop probability for this set. Must be given as a int value of a percentage (75 for 75%).
script : each line of the script corresponds to one item contained by the custom loot set.
The syntax is "sitemFileName itemQuantity itemQuality". Ex: ixpca01.sitem 50 42. This script handles C-style comments.
See also custom_loot_table.