feat(pipeline): add WPET (Wowee Pet System) catalog

Novel open replacement for AzerothCore-style pet_template +
pet_levelstats SQL + the pet-related subsets of
CreatureFamily.dbc + SpellFamilyName.dbc. The 38th open
format added to the editor.

Defines two related kinds of player-controlled NPCs in
one catalog:
  • Pet families  — hunter pet families (Wolf / Cat / Bear /
                     Boar / Raptor / Spider / etc.) with
                     per-family ability sets, base stat
                     multipliers, and diet preferences
  • Warlock minions — Imp / Voidwalker / Succubus /
                       Felhunter / Felguard, each with
                       their own summon spell, creature
                       template, and ability list

Cross-references with previously-added formats:
  WPET.family.familyId          -> WCRT.entry.familyId
                                    (matches creature family)
  WPET.family.abilities.spellId -> WSPL.entry.spellId
  WPET.minion.summonSpellId     -> WSPL.entry.spellId
  WPET.minion.creatureId        -> WCRT.entry.creatureId
                                    (used for stat scaling)
  WPET.minion.abilities.spellId -> WSPL.entry.spellId

The starter preset's familyIds (1=Wolf, 2=Cat) match
WCRT::FamilyId enum values, so a hunter taming a wolf via
WCRT links straight through to WPET ability sets.

Format:
  • magic "WPET", version 1, little-endian
  • families[]: familyId / name / description / icon /
    petType / baseAttackSpeed / damageMultiplier /
    armorMultiplier / dietMask / abilities[]
  • minions[]: minionId / name / summonSpellId / creatureId /
    abilities[] (each: spellId / rank / autocastDefault)

Enums:
  • PetType (3): Cunning / Ferocity / Tenacity
                  (WotLK+ talent tree categorization)
  • DietFlags:   Meat / Fish / Bread / Cheese / Fruit / Fungus

API: WoweePetLoader::save / load / exists +
WoweePet::findFamily / findMinion + dietMaskName helper
that decodes a dietMask into a "meat+fish" string.

Three preset emitters showcase typical pet catalogs:
  • makeStarter — 2 hunter families (Wolf + Cat) with full
                   3-ability sets + 1 warlock Imp
  • makeHunter  — 8 classic hunter families covering all
                   3 petType categories with appropriate
                   diet masks
  • makeWarlock — 5 warlock minions each with summon spell
                   ID and creatureId pointing into WCRT

CLI added (5 flags, 663 documented total now):
  --gen-pets / --gen-pets-hunter / --gen-pets-warlock
  --info-wpet / --validate-wpet

Validator catches: ids=0 + duplicates, empty name, petType
out of range, baseAttackSpeed<=0 (would divide by zero in
DPS calc), dietMask=0 (pet cannot be fed for happiness),
minion missing summonSpellId / creatureId.

tools/editor/cli_arg_required.cpp

@@ -109,6 +109,8 @@ const char* const kArgRequired[] = {
     "--export-wgld-json", "--import-wgld-json",
     "--gen-conditions", "--gen-conditions-gated", "--gen-conditions-event",
     "--info-wpcd", "--validate-wpcd",
+    "--gen-pets", "--gen-pets-hunter", "--gen-pets-warlock",
+    "--info-wpet", "--validate-wpet",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",