feat(pipeline): add WLIQ (Wowee Liquid Type) catalog

45th open format — replaces LiquidType.dbc plus the
AzerothCore-style terrain liquid descriptor data. Defines
liquid materials used by terrain MCNK liquid layers, WMO
interior pools, and procedurally generated fluid bodies in
custom zones. Each liquid pairs a render material (shader +
texture array + flow vectors + fog color) with gameplay data
(damage spell, raw DPS, ambient + splash audio cross-refs).

Cross-references with prior formats — ambientSoundId and
splashSoundId point at WSND.soundId, damageSpellId points at
WSPL.spellId.

10 liquid kinds (Water / Magma / Slime / OceanSalt / FelFire /
HolyLight / TarOil / AcidBog / FrozenWater / UnderworldGoo)
covering both natural and magical fluids. Per-liquid: viscosity
(0=water, 1=slime), flow direction+speed (radians+units/sec),
fog density+RGB, packed minimap RGBA color.

CLI: --gen-liquids (3-entry classic Water/Lava/Slime starter),
--gen-liquids-magical (4 magical pools incl. fel/holy/cosmic),
--gen-liquids-hazardous (3 high-damage liquids with WSPL DoT
cross-refs), --info-wliq, --validate-wliq with --json variants.
Validator catches id=0/duplicates, missing shader/material,
kind out of range, fog/viscosity outside 0..1, hazardous-kind-
without-damage warning, and Water/OceanSalt-with-damage warning
to flag accidental misconfiguration.

tools/editor/cli_arg_required.cpp

@@ -131,6 +131,8 @@ const char* const kArgRequired[] = {
     "--gen-holidays", "--gen-holidays-weekly", "--gen-holidays-special",
     "--info-whol", "--validate-whol",
     "--export-whol-json", "--import-whol-json",
+    "--gen-liquids", "--gen-liquids-magical", "--gen-liquids-hazardous",
+    "--info-wliq", "--validate-wliq",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",