[All] Link Creature_Equip_Template to item.dbc

[saben]

So currently it seems the only way to add an item to creatures is to use look-alike models. For instance, this commit added Bonechewer to Warlord Krom'zar when Blizzard uses Monster - Spear, Badass. However, there is no item_template for Monster - Spear, badass so the DB will set the equip_entry to 0.

This is fine for a lot of cases where there is a similar model ID with an item_template entry; however, then there are cases like Coilfang Warrior who's sword has a unique re-color that is only attached to Monster - Sword, Horde Sword Bronze.

[Olion]

All items should be defined in the item_template table, especially ones you're able to find in external DBs like mentioned above. If perchance you find a displayID not related to any known item, then create a custom item.

The linking proposed is also impossible to implement over [All] cores. For example, the classic has no Item.dbc at all, and the TBC format of Item.dbc (4 integers) differs from one for WotLK.