feat(editor): add WAUC JSON round-trip authoring workflow

Closes the WAUC open-format loop with --export-wauc-json /
--import-wauc-json, mirroring the JSON pairs added for
every other novel binary format. All 33 binary formats
added since WOL now have full JSON round-trip authoring.

Each house round-trips all 14 scalar fields plus the
factionAccess enum dual int + name forms (alliance / horde
/ neutral / both).

Verified byte-identical round-trip on the faction-pair
preset (3 houses including Stormwind/Orgrimmar/Booty Bay
with different cut rates and auctioneer NPC IDs preserved
through the JSON layer).

Adds 2 flags (679 documented total now).

tools/editor/cli_arg_required.cpp

@@ -115,6 +115,7 @@ const char* const kArgRequired[] = {
     "--export-wpet-json", "--import-wpet-json",
     "--gen-auction", "--gen-auction-pair", "--gen-auction-restricted",
     "--info-wauc", "--validate-wauc",
+    "--export-wauc-json", "--import-wauc-json",
     "--gen-channels", "--gen-channels-city", "--gen-channels-moderated",
     "--info-wchn", "--validate-wchn",
     "--gen-weather-temperate", "--gen-weather-arctic",