feat(pipeline): add WIT (Wowee Item Template) format

Novel open replacement for Blizzard's Item.dbc +
ItemDisplayInfo.dbc + the SQL item_template tables that
AzerothCore-style servers store item definitions in. The
12th open format added to the editor.

A WIT file holds the catalog of all items in a content
pack: weapons, armor, consumables, quest items, trade
goods. Each entry pairs gameplay metadata (stats, level
reqs, flags, weapon damage / speed) with display metadata
(displayId for icon / model, quality color), so the
runtime can render inventory tooltips and equip slots
from a single load.

Format:
  • magic "WITM", version 1, little-endian
  • per item: itemId / displayId / quality / itemClass /
    itemSubClass / inventoryType / flags / requiredLevel /
    itemLevel / sellPrice / buyPrice / maxStack / durability
    / damageMin / damageMax / attackSpeedMs /
    statCount + stats[] / name / description

Enums:
  • Quality:       Poor..Heirloom (8 levels)
  • Class:         Consumable, Weapon, Armor, Quest, ... (13)
  • InventoryType: Head..Cloak..Weapon2H (18 slots)
  • Flags:        Unique, BoP, BoE, QuestItem, Conjured, ...
  • StatType:     Stamina, Strength, Intellect, Defense, ...

API: WoweeItemLoader::save / load / exists / findById;
presets makeStarter (4-item demo), makeWeapons (5 items
common -> legendary), makeArmor (6-piece mail set with
BoE flag).

CLI added (5 flags, 480 documented total now):
  --gen-items / --gen-items-weapons / --gen-items-armor
  --info-wit / --validate-wit

Validator catches: itemId=0, duplicate itemIds, weapons
with 0 damage or attackSpeed, weapons with non-weapon
slot, equippables with durability=0 or maxStack>1, sell
price >= buy price (vendor would lose money), out-of-range
quality.

All 3 presets save / load / re-validate clean. Info-table
output includes a gold/silver/copper price formatter for
hand-readability.

tools/editor/cli_arg_required.cpp

@@ -32,6 +32,8 @@ const char* const kArgRequired[] = {
     "--gen-spawns", "--gen-spawns-camp", "--gen-spawns-village",
     "--info-wspn", "--validate-wspn",
     "--export-wspn-json", "--import-wspn-json",
+    "--gen-items", "--gen-items-weapons", "--gen-items-armor",
+    "--info-wit", "--validate-wit",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",