feat(editor): add WMAR (Raid Marker Set) — 117th open format

Novel replacement for the hardcoded 8-marker raid set
vanilla WoW shipped (Star/Circle/Diamond/Triangle/Moon/
Square/Cross/Skull) plus world-map pin markers and
5-man party role markers. Each entry binds one marker
slot to its icon resource, single-character chat-overlay
glyph (for "{star}" chat-style links), and priority for
sort order in the marker-picker UI.

Four markerKind values (RaidTarget / WorldMap / Party /
Custom) cover the full marker-system surface. The chat-
overlay displayChar field enables the WoW-canonical
chat shortcuts: "{star}" gets rendered as a star icon
inline in chat, with "*" as the fallback glyph for
non-rich-text contexts (clipboard, log files, mod-
script handlers).

Three preset emitters: makeRaidTargets (8 canonical
raid markers in /raidicon priority order 0..7 with
their iconic colors and glyph mnemonics), makeWorldMap-
Pins (5 world-map pin markers — Pin/Flag/Crosshair/
Question/Compass), makeParty (4 role markers for group-
finder filtering — Tank/Healer/DPS/Caster).

Validator's most novel checks: per-(markerKind,
priority) tuple uniqueness — two markers at same kind+
priority would render in unstable picker UI order. Plus
RaidTarget priority > 7 warns (exceeds canonical 8-slot
/raidicon dispatch range; client keybind macros may not
reach the slot).

Format count 116 -> 117. CLI flag count 1241 -> 1246.

tools/editor/cli_arg_required.cpp

@@ -359,6 +359,8 @@ const char* const kArgRequired[] = {
     "--gen-wfl", "--gen-wfl-caps", "--gen-wfl-url",
     "--info-wwfl", "--validate-wwfl",
     "--export-wwfl-json", "--import-wwfl-json",
+    "--gen-mar", "--gen-mar-world", "--gen-mar-party",
+    "--info-wmar", "--validate-wmar",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",