feat(editor): add WWFL (Word Filter) — 116th open format

Novel replacement for the implicit chat-moderation
patterns vanilla WoW carried in the bad-word checker
(the hardcoded substring list the CMSG_MESSAGECHAT
handler walked before broadcasting). Each entry defines
one pattern the chat preprocessor matches against
outbound messages, the replacement to apply (or
"drop"/"warn"/"mute" the sender), and a kind tag for
analytics.

Seven filterKind values (Spam / GoldSeller / AllCaps /
RepeatChar / URL / AdvertReward / Misc) and four
severity levels (Warn — log only, Replace — substitute
matched span, Drop — silently discard, Mute — drop AND
mute sender). Per-filter caseSensitive flag for context-
specific rules (uppercase shouting detection vs
lowercase RMT keyword detection).

Intentionally non-profanity focused — the ecosystem
distributes through CI / public PRs where embedded
profanity creates reviewer-experience and licensing
concerns. The presets cover the moderation surfaces
server admins actually need: makeSpamRMT (5 RMT
patterns: wts/wtb gold drops, g0ld typo-substitution
replace, 1000g-for bulk-offer drop, free-gold mute),
makeAllCaps (3 shouting patterns), makeURLDetect (3
URL-leakage patterns: http://, https://, www.).
Profanity-list integration is left to deployment-time
configuration where local laws and community standards
apply.

Validator's most novel check is per-pattern uniqueness
— two filters with the same pattern would dispatch
ambiguously through the chat preprocessor. Also warns
on Replace severity with empty replacement (would
silently lose match — use Drop explicitly if intended).

Format count 115 -> 116. CLI flag count 1234 -> 1239.

tools/editor/cli_arg_required.cpp

@@ -356,6 +356,8 @@ const char* const kArgRequired[] = {
     "--gen-trd", "--gen-trd-admin", "--gen-trd-rmt",
     "--info-wtrd", "--validate-wtrd",
     "--export-wtrd-json", "--import-wtrd-json",
+    "--gen-wfl", "--gen-wfl-caps", "--gen-wfl-url",
+    "--info-wwfl", "--validate-wwfl",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",