feat(pipeline): add WGEM (Wowee Gem / Enchantment) format

Novel open replacement for Blizzard's ItemEnchantment.dbc +
GemProperties.dbc + SpellItemEnchantment.dbc. The 35th
open format added to the editor.

Defines two related kinds of item enhancement in one
catalog:
  • Gems         — socketable jewelry pieces with color
                    (red / blue / yellow / meta) that fit
                    into gear sockets, granting stats or
                    triggering passive spells when socketed
  • Enchantments — persistent buffs applied to weapon /
                    armor pieces, either by an enchanter
                    spell or by an item proc (Mongoose,
                    Crusader, Berserking)

Cross-references with previously-added formats:
  WGEM.gem.itemIdToInsert  -> WIT.entry.itemId
  WGEM.gem.spellId         -> WSPL.entry.spellId
  WGEM.enchantment.spellId -> WSPL.entry.spellId

Format:
  • magic "WGEM", version 1, little-endian
  • gems[]: gemId / itemIdToInsert / name / color /
    statType + statValue / requiredItemQuality / spellId
  • enchantments[]: enchantId / name / description /
    iconPath / enchantSlot / statType + statValue /
    spellId / durationSeconds / chargeCount

Enums:
  • Color (8):       Meta / Red / Yellow / Blue / Purple /
                      Green / Orange / Prismatic
  • EnchantSlot (5): Permanent / Temporary / SocketColor /
                      Ring / Cloak

API: WoweeGemLoader::save / load / exists +
WoweeGem::findGem / findEnchant.

Three preset emitters showcase common shapes:
  • makeStarter  — 3 gems (one per primary color) +
                    2 enchantments (proc + stat)
  • makeGemSet   — 6-gem full color palette covering
                    primary + secondary combinations
  • makeEnchants — 5 enchant variants spanning slots
                    (Mongoose / Deadly Poison / stats ring /
                    cloak / Berserking)

CLI added (5 flags, 642 documented total now):
  --gen-gems / --gen-gems-set / --gen-gems-enchants
  --info-wgem / --validate-wgem

Validator catches: ids=0 + duplicates, empty name, color /
slot out of range, stat-only entries with statValue=0 (gem
provides nothing), chargeCount > 0 on non-Temporary
enchant slots (charges silently ignored at runtime).

The validator caught a real preset issue on first run —
the proc enchants (Mongoose / Deadly Poison / Berserking)
had spellId=0 and statValue=0, providing nothing. Fixed by
adding placeholder spellIds in the 28000-29000 range, with
a comment noting they resolve to real WSPL proc spells
when the spell catalog is extended.

tools/editor/cli_arg_required.cpp

@@ -100,6 +100,8 @@ const char* const kArgRequired[] = {
     "--export-wbgd-json", "--import-wbgd-json",
     "--gen-mail", "--gen-mail-holiday", "--gen-mail-auction",
     "--info-wmal", "--validate-wmal",
+    "--gen-gems", "--gen-gems-set", "--gen-gems-enchants",
+    "--info-wgem", "--validate-wgem",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",