feat(pipeline): add WCMS (Wowee Cinematic) catalog

41st open format — replaces Movie.dbc / CinematicCamera.dbc /
CinematicSequences.dbc plus the AzerothCore cinematic_camera SQL
table. Defines pre-rendered videos, in-engine camera flythroughs,
text crawls, and still images, each with a media path, duration,
skippable flag, and a polymorphic trigger that fires on quest
events / class first-login / zone entry / dungeon clear /
achievements / level milestones.

Cross-references with prior formats — triggerTargetId resolves
by triggerKind to WQT.questId / WMS.areaId / WMS.mapId /
WCHC.classId / WACH.achievementId, and soundtrackId points at
WSND.soundId.

CLI: --gen-cinematics (3-entry starter), --gen-cinematics-intros
(4 class intros), --gen-cinematics-quests (3 quest-bound
cinematics referencing demo questIds 1/100/102), --info-wcms,
--validate-wcms with --json variants. Validator catches
id=0/duplicates, empty name/mediaPath, kind/trigger out of
range, missing target id for non-Manual/Login/LevelUp triggers,
zero-duration entries, and non-skippable pre-rendered videos.

tools/editor/cli_arg_required.cpp

@@ -118,6 +118,8 @@ const char* const kArgRequired[] = {
     "--export-wauc-json", "--import-wauc-json",
     "--gen-channels", "--gen-channels-city", "--gen-channels-moderated",
     "--info-wchn", "--validate-wchn",
+    "--gen-cinematics", "--gen-cinematics-intros", "--gen-cinematics-quests",
+    "--info-wcms", "--validate-wcms",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",