Updated skinning_loot_template and pickpocketing_loot_template with correct values.
This includes Herbalism loot, Skinning loot, Pickpocketing loot, Engineering loot and Mining loot.

Treshold set to 2,5%
Created 508 Skinning entries with 1726 Items.
Created 117 Herbalism entries with 1360 Items.
Created 70 Mining entries with 362 Items.
Created 37 Engineering entries with 248 Items.
Created 2424 Pickpocketing entries with 13927 Items.
Updated total of 46627 creature_template entries.